Olive oil

For the Popeye character, see Olive Oyl.

Olive oil

Extra virgin olive oil presented with green and black preserved table olives
Fat composition
Saturated fats
Total saturated	Palmitic acid: 13.0% Stearic acid: 1.5%
Unsaturated fats
Total unsaturated	> 85%
Monounsaturated	Oleic acid: 70.0% Palmitoleic acid: 0.3–3.5%
Polyunsaturated	Linoleic acid: 15.0% α-Linolenic acid: 0.5%
Properties
Food energy per 100 g (3.5 oz)	3,700 kJ (880 kcal)
Melting point	−6.0 °C (21.2 °F)
Boiling point	299 °C (570 °F)
Smoke point	190–215 °C (374–419 °F) (extra virgin) [1] 215 °C (419 °F) (virgin) [2] 210 °C (410 °F) (refined)
Solidity at 20 °C (68 °F)	Liquid
Specific gravity at 20 °C (68 °F)	0.911 [3]
Viscosity at 20 °C (68 °F)	84  cP
Refractive index	1.4677–1.4705 (virgin and refined) 1.4680–1.4707 (pomace)
Iodine value	75–94 (virgin and refined) 75–92 (pomace)
Acid value	maximum: 6.6%[ inconsistent ](refined and pomace) 0.8% (extra virgin)
Saponification value	184–196 (virgin and refined) 182–193 (pomace)
Peroxide value	20 (virgin) 10 (refined and pomace)

Olive oil is a liquid fat obtained by pressing whole olives, the fruit of Olea europaea, a traditional tree crop of the Mediterranean Basin, and extracting the oil.

It is commonly used in cooking for frying foods, as a condiment, or as a salad dressing. It can also be found in some cosmetics, pharmaceuticals, soaps, and fuels for traditional oil lamps. It also has additional uses in some religions. The olive is one of three core food plants in Mediterranean cuisine, together with wheat and grapes. Olive trees have been cultivated around the Mediterranean since the 8th millennium BC.

Spain is the world's largest producer, manufacturing almost half of the world's olive oil. Other large producers are Italy, Greece, Portugal, Tunisia, Turkey and Morocco.

The composition of olive oil varies with the cultivar, altitude, time of harvest, and extraction process. It consists mainly of oleic acid (up to 83%), with smaller amounts of other fatty acids including linoleic acid (up to 21%) and palmitic acid (up to 20%). Extra virgin olive oil (EVOO) is required to have no more than 0.8% free acidity, and is considered to have favorable flavor characteristics.

History

Olive oil has long been a common ingredient in Mediterranean cuisine, including ancient Greek and Roman cuisine. Wild olives, which originated in Asia Minor, were collected by Neolithic people as early as the 8th millennium BC. ^{[4] [5]} Besides food, olive oil has been used for religious rituals, medicines, as a fuel in oil lamps, soap-making, and skincare application.^{[ citation needed ]} The Spartans and other Greeks used oil to rub themselves while exercising in the gymnasia. From its beginnings early in the 7th century BC, the cosmetic use of olive oil quickly spread to all of the Hellenic city-states, together with athletes training in the nude, and lasted close to a thousand years despite its great expense. ^{[6] [7]} Olive oil was also popular as a form of birth control; Aristotle in his History of Animals recommends applying a mixture of olive oil combined with either oil of cedar, ointment of lead, or ointment of frankincense to the cervix to prevent pregnancy. ^[8]

Early cultivation

Ancient Greek olive oil production workshop in Klazomenai, Ionia (modern Turkey)

It is not clear when and where olive trees were first domesticated. The modern olive tree may have originated in ancient Persia and Mesopotamia and spread to the Levant and later to North Africa, though some scholars argue for an Egyptian origin. ^[9]

The olive tree reached Greece, Carthage and Libya sometime in the 28th century BC, having been spread westward by the Phoenicians. ^[9] Until around 1500 BC, eastern coastal areas of the Mediterranean were most heavily cultivated.^{[ citation needed ]} Evidence also suggests that olives were being grown in Crete as long ago as 2500 BC. The earliest surviving olive oil amphorae date to 3500 BC (Early Minoan times), though the production of olive oil is assumed to have started before 4000 BC. ^[10] Olive trees were certainly cultivated by the Late Minoan period (1500 BC) in Crete, and perhaps as early as the Early Minoan. ^[11] The cultivation of olive trees in Crete became particularly intense in the post-palatial period and played an important role in the island's economy, as it did across the Mediterranean. ^[12] Later, as Greek colonies were established in other parts of the Mediterranean, olive farming was introduced to places like Spain and continued to spread throughout the Roman Empire. ^[9]

Olive trees were introduced to the Americas in the 16th century, when cultivation began in areas with a climate similar to the Mediterranean, such as Chile, Argentina, and California. ^[9]

Recent genetic studies suggest that species used by modern cultivators descend from multiple wild populations, but detailed history of domestication is unknown. ^[13]

Trade and production

Ancient oil press (Bodrum Museum of Underwater Archaeology, Bodrum, Turkey)

Archaeological evidence in Galilee shows that by 6000 BC olives were being turned into olive oil ^[14] and in 4500 BC at a now-submerged prehistoric settlement south of Haifa. ^[15]

Olive trees and oil production in the Eastern Mediterranean can be traced to archives of the ancient city-state Ebla (2600–2240 BC), which were located on the outskirts of Aleppo. Here some dozen documents dated 2400 BC describe the lands of the king and the queen. These belonged to a library of clay tablets perfectly preserved by having been baked in the fire that destroyed the palace. A later source is the frequent mentions of oil in the Tanakh. ^[16]

Dynastic Egyptians before 2000 BC imported olive oil from Crete, Syria and Canaan, and oil was an important item of commerce and wealth. Remains of olive oil have been found in jugs over 4,000 years old in a tomb on the island of Naxos in the Aegean Sea. Sinuhe, the Egyptian exile who lived in northern Canaan c.1960 BC, wrote of abundant olive trees. ^[17] The Minoans used olive oil in religious ceremonies. The oil became a principal product of the Minoan civilization, where it is thought to have represented wealth. ^[18]

Olive oil was also a major export of Mycenaean Greece (c. 1450–1150 BC). ^{[19] [9]} Scholars believe the oil was made by a process where olives were placed in woven mats and squeezed. The oil was collected in vats. This process was known from the Bronze Age, was used by the Egyptians, and continued to be used through the Hellenistic period. ^[9]

Olive crusher (trapetum) in Pompeii (79 AD)

The importance of olive oil as a commercial commodity increased after the Roman conquest of Egypt, Greece and Asia Minor led to more trade along the Mediterranean. Olive trees were planted throughout the entire Mediterranean basin during evolution of the Roman Republic and Empire. According to the historian Pliny the Elder, Italy had "excellent olive oil at reasonable prices" by the 1st century AD—"the best in the Mediterranean".^{[ citation needed ]} As olive production expanded in the 5th century AD the Romans began to employ more sophisticated production techniques such as the olive press and trapetum (pictured left). ^[9] Many ancient presses still exist in the Eastern Mediterranean region, and some dating to the Roman period are still in use today. ^[20] Productivity was greatly improved by Joseph Graham's development of the hydraulic pressing system in 1795. ^[9]

The Manufacture of Oil, 16th-century engraving by Jost Amman

Symbolism and mythology

The olive tree has historically been a symbol of peace between nations. It has played a religious and social role in Greek mythology, especially concerning the city of Athens, named after the goddess Athena because her gift of an olive tree was held to be more precious than rival Poseidon's gift of a salt spring. ^[9]

Varieties

Main article: List of olive cultivars

There are many olive cultivars, each with a particular flavor, texture, and shelf life that make them more or less suitable for different applications, such as direct human consumption on bread or in salads, indirect consumption in domestic cooking or catering, or industrial uses such as animal feed or engineering applications. ^[21] During the stages of maturity, olive fruit changes colour from green to violet, and then black. Olive oil taste characteristics depend on the stage of ripeness at which olive fruits are collected. ^[21]

Uses

Culinary use

Vinegar and olive oil

Olive oil served with bread

Olive oil is an important cooking oil in countries surrounding the Mediterranean, and it forms one of the three staple food plants of Mediterranean cuisine, the other two being wheat (as in pasta, bread, and couscous), and the grape, used as a dessert fruit and for wine. ^[22]

Extra virgin olive oil is mostly used raw as a condiment and as an ingredient in salad dressings. If uncompromised by heat, the flavor is stronger. It also can be used for sautéing.

When extra virgin olive oil is heated above 210–216 °C (410–421 °F), depending on its free fatty acid content, the unrefined particles within the oil are burned. This leads to deteriorated taste. Refined olive oils are suited for deep frying because of the higher smoke point and milder flavour. ^[23] Extra virgin oils have a smoke point around 180–215 °C (356–419 °F), ^[1] with higher-quality oils having a higher smoke point, ^[24] whereas refined light olive oil has a smoke point up to 230 °C (446 °F). ^[1] That they can be used for deep frying is contrary to the common misconception that there are no olive oils with a smoke point as high as many other vegetable oils. In the misconception, heating at these high heats is theorised to impact taste or nutrition. ^{[25] [26]}

Religious use

Christianity

The Roman Catholic, Orthodox and Anglican churches use olive oil for the oil of catechumens (used to bless and strengthen those preparing for baptism) and oil of the sick (used to confer the Sacrament of anointing of the sick or extreme unction). Olive oil mixed with a perfuming agent such as balsam is consecrated by bishops as sacred chrism, which is used to confer the sacrament of confirmation (as a symbol of the strengthening of the Holy Spirit), in the rites of baptism and the ordination of priests and bishops, in the consecration of altars and churches, and, traditionally, in the anointing of monarchs at their coronation.

Eastern Orthodox Christians still use oil lamps in their churches, home prayer corners, and cemeteries. A vigil lamp consists of a votive glass filled with olive oil, floating on a half-inch of water. The glass has a metal holder that hangs from a bracket on the wall or sits on a table. A cork float with a lit wick floats on the oil. To douse the flame, the float is carefully pressed down into the oil. Makeshift oil lamps can easily be made by soaking a ball of cotton in olive oil and forming it into a peak. The peak is lit and then burns until all the oil is consumed, whereupon the rest of the cotton burns out. Olive oil is a usual offering to churches and cemeteries.

The Church of Jesus Christ of Latter-day Saints uses virgin olive oil that has been blessed by the priesthood for anointing the sick. ^[27]

Judaism

In Jewish observance, olive oil was the only fuel allowed to be used in the seven-branched menorah in the Mishkan service during the Exodus of the Tribes of Israel from Egypt, and later in the permanent Temple in Jerusalem. It was obtained by using only the first drop from a squeezed olive and was consecrated for use only in the Temple by the priests and stored in special containers. In modern times, although candles can be used to light the menorah at Hanukkah, oil containers are preferred, to imitate the original menorah. ^[28]

In Judaism of Ancient Israel, olive oil was also used to prepare the holy anointing oil used for priests, kings, prophets, and others. ^[29]

Other

Olive oil is also a natural and safe lubricant, and can be used to lubricate kitchen machinery (grinders, blenders, cookware, etc.). It can also be used for illumination (oil lamps) or as the base for soaps and detergents. ^[30] Some cosmetics also use olive oil as their base, ^[31] and it can be used as a substitute for machine oil. ^{[32] [33] [34]} Olive oil has also been used as both solvent and ligand in the synthesis of cadmium selenide quantum dots. ^[35]

The Ranieri Filo della Torre is an international literary prize for writings about extra virgin olive oil. It yearly honors poetry, fiction and non-fiction about extra virgin olive oil.

Extraction

Main article: Olive oil extraction

A cold press olive oil machine in Israel

Olive oil mill

Olive oil is produced by grinding olives and extracting the oil by mechanical or chemical means. Green olives usually produce more bitter oil, and overripe olives can produce oil with fermentation defects, so for good olive oil care is taken to make sure the olives are perfectly ripe. The process is generally as follows:

1. The olives are ground into paste using large millstones (traditional method), hammer, blade or disk mill (modern method).
2. If ground with millstones, the olive paste generally stays under the stones for 30 to 40 minutes. A shorter grinding process may result in a more raw paste that produces less oil and has a less ripe taste, a longer process may increase oxidation of the paste and reduce the flavor. After grinding, the olive paste is spread on fiber disks, which are stacked on top of each other in a column, then placed into the press. Pressure is then applied onto the column to separate the vegetal liquid from the paste. This liquid still contains a significant amount of water. Traditionally the oil was shed from the water by gravity (oil is less dense than water). This very slow separation process has been replaced by centrifugation, which is much faster and more thorough. The centrifuges have one exit for the (heavier) watery part and one for the oil. Olive oil should not contain significant traces of vegetal water as this accelerates the process of organic degeneration by microorganisms. The separation in smaller oil mills is not always perfect, thus sometimes a small watery deposit containing organic particles can be found at the bottom of oil bottles.
3. Modern grinders reduce the olives to paste in seconds. After grinding, the paste is stirred slowly for another 20 to 30 minutes in a particular container (malaxation), where the microscopic oil drops aggregate into bigger drops, which facilitates the mechanical extraction. The paste is then pressed by centrifugation/ the water is thereafter separated from the oil in a second centrifugation as described before.

   The oil produced by only physical (mechanical) means as described above is called virgin oil. ^[36] Extra virgin olive oil is virgin olive oil that satisfies specific high chemical and organoleptic criteria (low free acidity, no or very little organoleptic defects). A higher grade extra virgin olive oil is mostly dependent on favourable weather conditions; a drought during the flowering phase, for example, can result in a lower quality (virgin) oil. Olive trees produce well every couple of years, so greater harvests occur in alternate years (the year in-between is when the tree yields less). However the quality is still dependent on the weather.

4. Sometimes the produced oil will be filtered to eliminate remaining solid particles that may reduce the shelf life of the product. Labels may indicate the fact that the oil has not been filtered, suggesting a different taste. Fresh unfiltered olive oil usually has a slightly cloudy appearance, and is therefore sometimes called cloudy olive oil. This form of olive oil used to be popular only among small scale producers but is now becoming "trendy", in line with consumer's demand for products that are perceived to be less processed. But generally, if not tasted or consumed soon after production, filtered olive oil should be preferred: "Some producers maintain that extra-virgin olive oils do not need filtration but also that filtration is detrimental to oil quality. This point of view should be considered as erroneous and probably the result of improper implementation of this operation. In fact, fine particles that are suspended in a virgin olive oil, even after the most effective centrifugal finishing, contain water and enzymes that may impair oil stability and ruin its sensory profile. ... Filtration makes an extra-virgin olive oil more stable and also more attractive. If the suspended particles are not removed they slowly agglomerate and flocculate, forming a deposit on the bottom of the storage containers. Such a deposit continues to be at risk of enzymatic spoilage and, in the worst case, of development of anaerobic micro-organisms with further spoilage and hygienic risk. ... It is ... recommended that filtration be carried out as soon as possible after centrifugal separation and finishing." ^[37]

Ancient Levant

In the ancient Levant, three methods were used to produce different grades of olive oil. ^[38] The finest oil was produced from fully developed and ripe olives harvested solely from the apex of the tree, ^[39] and lightly pressed, "for what flows from light pressure is very sweet and very thin". ^[40] The remaining olives are pressed with a heavier weight, ^[40] and vary in ripeness. ^[39] Inferior oil is produced from unripe olives that are stored for extended periods of time until they grow soft or begin to shrivel to become more fit for grinding. ^[41] Others are left for extended periods in pits in the ground to induce sweating and decay before they are ground. ^[42] According to the Geoponica , salt and a little nitre are added when oil is stored. ^[40]

In countries of the levant, a sharp-tasting green oil was sometimes extracted from unripe olives, known in medieval times as anpeqinon^{[ verification needed ]} (Ancient Greek : ὀμφάκιον, ὀμφάχινον; Arabic : زيت الأنفاق), being a corruption of the Latin words oleum omphacium and used in cuisine and in medicine. ^{[43] [44] [45]} Today, this oil is called "virgin oil" in English. ^[43]

Pomace handling

The remaining semi-solid waste, called pomace, retains a small quantity (about 5–10%) of oil that cannot be extracted by further pressing, but only with chemical solvents. This is done in specialized chemical plants, not in the oil mills. The resulting oil is named pomace oil. ^[46]

Handling of olive waste is an environmental challenge because the wastewater, which amounts to millions of tons (billions of liters) annually in the European Union, has low biodegradability, is toxic to plants, and cannot be processed through conventional water treatment systems. ^[46] Traditionally, olive pomace would be used as compost or developed as a possible biofuel, although these uses introduce concern due to chemicals present in the pomace. ^[46] A process called "valorization" of olive pomace is under research and development, consisting of additional processing to obtain value-added byproducts, such as animal feed, food additives for human products, and phenolic and fatty acid extracts for potential human use. ^[46]

Global market

Production

Olive oil production – annual average 2023 to 2024 ^{[47] [48] [ failed verification ]}

Country	Production (tonnes)
Spain	766,400
Italy	288,900
Turkey	210,000
Tunisia	200,000
Greece	195,000
Portugal	150,000
Morocco	106,000
Syria	95,000
Algeria	93,000
World	2,407,000

On average, during the period 2016 to 2021, world production of olive oil was 3.1 million metric tons (3.4 million short tons). ^[49] Spain produced 44% of world production. The next largest producers were Italy, Greece, Tunisia, Turkey and Morocco. ^[49]

Villacarrillo, Jaén, Andalucía, Spain is a center of olive oil production. Spain's olive oil production derives 75% from the region of Andalucía, particularly within Jaén province which produces 70% of the olive oil in Spain. ^[50] The world's largest olive oil mill (almazara, in Spanish), capable of processing 2,500 tonnes of olives per day, is in the town of Villacarrillo, Jaén. ^[50]

Italian major producers are the regions of Calabria and, above all, Apulia. Many PDO and PGI extra-virgin olive oil are produced in these regions. Extra-virgin olive oil is also produced in Tuscany, ^[51] in cities including Lucca, Florence, and Siena, which are also included in the association of Città dell'Olio. ^[52] Italy imports about 65% of Spanish olive oil exports. ^[53]

Global consumption

Greece has by far the largest per capita consumption of olive oil worldwide, around 24 liters per year. ^[54] Consumption in Spain is 15 liters; Italy 13 liters; ^[54] and Israel, around 3 liters. ^[55] Canada consumes 1.5 liters and the US 1 liter. ^[54]

Regulation

Main article: Olive oil regulation and adulteration

The International Olive Council (IOC) is an intergovernmental organisation of states that produce olives or products derived from olives, such as olive oil. The IOC officially governs 95% of international production and holds great influence over the rest. The EU regulates the use of different protected designation of origin labels for olive oils. ^[56]

The United States is not a member of the IOC and is not subject to its authority, but on October 25, 2010, the U.S. Department of Agriculture adopted new voluntary olive oil grading standards that closely parallel those of the IOC, with some adjustments for the characteristics of olives grown in the U.S. ^[57] U.S. Customs regulations on "country of origin" state that if a non-origin nation is shown on the label, then the real origin must be shown on the same side of the label in letters of comparable size, so as not to mislead the consumer. ^{[58] [59]} Yet most major U.S. brands continue to put "imported from Italy" on the front label in large letters and other origins on the back in very small print. ^[60] "In fact, olive oil labeled 'Italian' often comes from Turkey, Tunisia, Morocco, Spain, and Greece." ^[61] This makes it unclear what percentage of the olive oil is really of Italian origin.

Commercial grades

A bottle of Italian olive oil

All production begins by transforming the olive fruit into olive paste by crushing or pressing. This paste is then malaxed (slowly churned or mixed) to allow the microscopic oil droplets to agglomerate. The oil is then separated from the watery matter and fruit pulp with the use of a press (traditional method) or centrifugation (modern method). After extraction the remnant solid substance, called pomace, still contains a small quantity of oil.

One parameter used to characterise an oil is its acidity. ^[62] In this context, "acidity" is not chemical acidity in the sense of pH, but the percent (measured by weight) of free oleic acid. Measured by quantitative analysis, acidity is a measure of the hydrolysis of the oil's triglycerides: as the oil degrades, more fatty acids are freed from the glycerides, increasing the level of free acidity and thereby increasing hydrolytic rancidity.^{[ citation needed ]} Another measure of the oil's chemical degradation is the peroxide value, ^[63] which measures the degree to which the oil is oxidized by free radicals, leading to oxidative rancidity. Phenolic acids present in olive oil also add acidic sensory properties to aroma and flavor. ^[64]

The grades of oil extracted from the olive fruit can be classified as:

• Virgin means the oil was produced by the use of mechanical means only, with no chemical treatment. The term virgin oil with reference to production method includes all grades of virgin olive oil, including extra virgin, virgin, ordinary virgin and Lampante virgin olive oil products, depending on quality (see below).
• Lampante virgin oil is olive oil extracted by virgin (mechanical) methods but not suitable for human consumption without further refining; "lampante" is the attributive form of "lampa", the Italian word for "lamp", referring to the use of such oil in oil lamps. Lampante virgin oil can be used for industrial purposes, or refined (see below) to make it edible. ^[65]
• Refined olive oil is the olive oil obtained from any grade of virgin olive oil by refining methods which do not lead to alterations in the initial glyceridic structure. The refining process removes colour, odour and flavour from the olive oil, and leaves behind a very pure form of olive oil that is tasteless, colourless and odourless and extremely low in free fatty acids. Olive oils sold as the grades extra virgin olive oil and virgin olive oil therefore cannot contain any refined oil. ^[65]
• Crude olive pomace oil is the oil obtained by treating olive pomace (the leftover paste after the pressing of olives for virgin olive oils) with solvents or other physical treatments, to the exclusion of oils obtained by re-esterification processes and of any mixture with oils of other kinds. It is then further refined into refined olive pomace oil and once re-blended with virgin olive oils for taste, is then known as olive pomace oil. ^[65]

Italian label for "extra vergine" oil

International Olive Council

In countries that adhere to the standards of the International Olive Council, ^[66] as well as in Australia, and under the voluntary United States Department of Agriculture labeling standards in the United States:

Extra virgin olive oil is the highest grade of virgin olive oil derived by cold mechanical extraction without use of solvents or refining methods. ^{[65] [67]} It contains no more than 0.8% free acidity, and is judged to have a superior taste, having some fruitiness and no defined sensory defects. ^[68] Extra virgin olive oil accounts for less than 10% of oil in many producing countries; the percentage is far higher in some Mediterranean countries.

The International Olive Council requires the median of the fruity attribute to be higher than zero for a given olive oil in order to meet the criteria of extra virgin olive oil classification.

Virgin olive oil is a lesser grade of virgin oil, with free acidity of up to 2.0%, and is judged to have a good taste, but may include some sensory defects.

Refined olive oil is virgin oil that has been refined using charcoal and other chemical and physical filters, methods which do not alter the glyceridic structure. It has a free acidity, expressed as oleic acid, of not more than 0.3 grams per 100 grams (0.3%) and its other characteristics correspond to those fixed for this category in this standard. It is obtained by refining virgin oils to eliminate high acidity or organoleptic defects. Oils labeled as pure olive oil or olive oil are primarily refined olive oil, with a small addition of virgin for taste.

Olive pomace oil is refined pomace olive oil, often blended with some virgin oil. It is fit for consumption, but may not be described simply as olive oil. It has a more neutral flavor than pure or virgin olive oil, making it less desirable to users concerned with flavor; however, it has the same fat composition as regular olive oil, giving it the same health benefits. It also has a high smoke point, and consequently is widely used in restaurants as well as home cooking in some countries.

United States

The United States is not a member of the IOC and does not implement its grades, but on October 25, 2010, the United States Department of Agriculture (USDA) established Standards for Grades of Olive Oil and Olive-Pomace Oil which closely parallel the IOC standards: ^{[69] [70]}

• U.S. extra virgin olive oil for oil with excellent flavor and odor and free fatty acid content of not more than 0.8 g per 100 g (0.8%);
• U.S. virgin olive oil for oil with reasonably good flavor and odor and free fatty acid content of not more than 2 g per 100 g (2%);
• U.S. virgin olive oil Not Fit For Human Consumption Without Further Processing is a virgin (mechanically-extracted) olive oil of poor flavor and odor, equivalent to the IOC's lampante oil;
• U.S. olive oil is a mixture of virgin and refined oils;
• U.S. refined olive oil is an oil made from refined oils with some restrictions on the processing.

These grades are voluntary. Certification is available, for a fee, from the USDA. ^[70]

In 2014, California adopted a set of olive oil standards for olive oil made from California-grown olives. The California Department of Food and Agriculture Grade and Labeling Standards for Olive Oil, Refined-Olive Oil and Olive-Pomace Oil are mandatory for producers of more than 5,000 gallons of California olive oil. This joins other official state, federal and international olive oil standards. ^[71]

Several olive producer associations, such as the North American Olive Oil Association and the California Olive Oil Council, also offer grading and certification within the United States. ^{[72] [73]} Oleologist Nicholas Coleman suggests that the California Olive Oil Council certification is the most stringent of the voluntary grading schemes in the United States. ^[74]

Country of origin can be established by one or two letter country codes printed on the bottle or label. Country codes include I=Italy, GR=Greece, E=Spain, TU=Tunisia, MA=Morocco, CL=Chile, AG=Argentina, AU=Australia.

Label wording

• Different names for olive oil indicate the degree of processing the oil has undergone as well as the quality of the oil. Extra virgin olive oil is the highest grade available, followed by virgin olive oil. The word "virgin" indicates that the olives have been pressed to extract the oil; no heat or chemicals have been used during the extraction process, and the oil is pure and unrefined. Virgin olive oils contain the highest levels of polyphenols, antioxidants that have been linked with better health. ^[75]
• Olive Oil, which is sometimes denoted as being "Made from refined and virgin olive oils" is a blend of refined olive oil with a virgin grade of olive oil. ^[65] Pure, Classic, Light and Extra-Light are terms introduced by manufacturers in countries that are non-traditional consumers of olive oil for these products to indicate both their composition of being only 100% olive oil, and also the varying strength of taste to consumers. Contrary to a common consumer belief, they do not have fewer calories than extra virgin oil as implied by the names. ^[76]
• Cold pressed or Cold extraction means "that the oil was not heated over a certain temperature (usually 27 °C (80 °F)) during processing, thus retaining more nutrients and undergoing less degradation". ^[77] The difference between Cold Extraction and Cold Pressed is regulated in Europe, where the use of a centrifuge, the modern method of extraction for large quantities, must be labelled as Cold Extracted, while only a physically pressed olive oil may be labelled as Cold Pressed. In many parts of the world, such as Australia, producers using centrifugal extraction still label their products as Cold Pressed.
• First cold pressed means "that the fruit of the olive was crushed exactly one time – i.e., the first press. The cold refers to the temperature range of the fruit at the time it is crushed". ^[78] In Calabria (Italy) the olives are collected in October. In regions like Tuscany or Liguria, the olives collected in November and ground, often at night, are too cold to be processed efficiently without heating. The paste is regularly heated above the environmental temperatures, which may be as low as 10–15 °C, to extract the oil efficiently with only physical means. Olives pressed in warm regions like Southern Italy or Northern Africa may be pressed at significantly higher temperatures although not heated. While it is important that the pressing temperatures be as low as possible (generally below 25 °C) there is no international reliable definition of "cold pressed".
  Furthermore, there is no "second" press of virgin oil, so the term "first press" means only that the oil was produced in a press vs. other possible methods.
• Protected designation of origin (PDO) and protected geographical indication (PGI) refer to olive oils with "exceptional properties and quality derived from their place of origin as well as from the way of their production". ^[79]
• The label may indicate that the oil was bottled or packed in a stated country. This does not necessarily mean that the oil was produced there. The origin of the oil may sometimes be marked elsewhere on the label; it may be a mixture of oils from more than one country. ^[60]
• The U.S. Food and Drug Administration permitted a claim on olive oil labels stating: "Limited and not conclusive scientific evidence suggests that eating about two tablespoons (23 g) of olive oil daily may reduce the risk of coronary heart disease." ^[80]

Adulteration

There have been allegations, particularly in Italy and Spain, that regulation can be sometimes lax and corrupt. ^[81] Major shippers are claimed to routinely adulterate olive oil so that only about 40% of olive oil sold as "extra virgin" in Italy actually meets the specification. ^[82] In some cases, colza oil (extracted from rapeseed) with added colour and flavor has been labeled and sold as olive oil. ^[83] This extensive fraud prompted the Italian government to mandate a new labeling law in 2007 for companies selling olive oil, under which every bottle of Italian olive oil would have to declare the farm and press on which it was produced, as well as display a precise breakdown of the oils used, for blended oils. ^[84] In February 2008, however, EU officials took issue with the new law, stating that under EU rules such labeling should be voluntary rather than compulsory. ^[83] Under EU rules, olive oil may be sold as Italian even if it only contains a small amount of Italian oil. ^[84]

Extra virgin olive oil has strict requirements and is checked for "sensory defects" that include: rancid, fusty, musty, winey (vinegary) and muddy sediment. These defects can occur for different reasons. The most common are:

• Raw material (olives) infected or battered
• Inadequate harvest, with contact between the olives and soil ^[85]

In March 2008, 400 Italian police officers conducted Operation Golden Oil, arresting 23 people and confiscating 85 farms after an investigation revealed a large-scale scheme to relabel oils from other Mediterranean nations as Italian. ^[86] In April 2008, another operation impounded seven olive oil plants and arrested 40 people in nine provinces of northern and southern Italy for adding chlorophyll to sunflower and soybean oil and selling it as extra virgin olive oil, both in Italy and abroad; 25,000 liters of the fake oil were seized and prevented from being exported. ^[87]

On March 15, 2011, the prosecutor's office in Florence, Italy, working in conjunction with the forestry department, indicted two managers and an officer of Carapelli, one of the brands of the Spanish company Grupo SOS (which recently changed its name to Deoleo). The charges involved falsified documents and food fraud. Carapelli lawyer Neri Pinucci said the company was not worried about the charges and that "the case is based on an irregularity in the documents." ^[88]

In February 2012, Spanish authorities investigated an international olive oil fraud in which palm, avocado, sunflower and other cheaper oils were passed off as Italian olive oil. Police said the oils were blended in an industrial biodiesel plant and adulterated in a way to hide markers that would have revealed their true nature. The oils were not toxic and posed no health risk, according to a statement by the Guardia Civil. Nineteen people were arrested following the year-long joint probe by the police and Spanish tax authorities, as part of Operation Lucerna. ^[89]

Using tiny print to state the origin of blended oil is used as a legal loophole by manufacturers of adulterated and mixed olive oil. ^[90]

Journalist Tom Mueller has investigated crime and adulteration in the olive oil business, publishing the article "Slippery Business" in New Yorker magazine, ^[82] followed by the 2011 book Extra Virginity . On 3 January 2016 Bill Whitaker presented a program on CBS News including interviews with Mueller and with Italian authorities. ^{[91] [92]} It was reported that in the previous month 5,000 tons of adulterated olive oil had been sold in Italy, and that organised crime was heavily involved—the term "Agrimafia" was used. The point was made by Mueller that the profit margin on adulterated olive oil was three times that on the illegal narcotic drug cocaine. He said that over 50% of olive oil sold in Italy was adulterated, as was 75–80% of that sold in the US. Whitaker reported that three samples of "extra virgin olive oil" had been bought in a US supermarket and tested; two of the three samples did not meet the required standard, and one of them—from a top-selling US brand—was exceptionally poor.

In early February 2017, the Carabinieri police arrested 33 suspects in the Calabrian mafia's Piromalli 'ndrina ('Ndrangheta) which was allegedly exporting fake extra virgin olive oil to the U.S.; the product was actually inexpensive olive pomace oil fraudulently labeled. ^[93] Less than a year earlier, the American television program 60 Minutes had warned that "the olive oil business has been corrupted by the Mafia" and that "Agromafia" was a 16 billion dollar per year enterprise. A Carabinieri investigator interviewed on the program said that "olive oil fraud has gone on for the better part of four millennia" but today, it's particularly "easy for the bad guys to either introduce adulterated olive oils or mix in lower quality olive oils with extra-virgin olive oil". ^[94] Weeks later, a report by Forbes magazine stated that "it's reliably reported that 80% of the Italian olive oil on the [US] market is fraudulent" and that "a massive olive oil scandal is being uncovered in Southern Italy (Puglia, Umbria and Campania)". ^[95]

Quality control and fraud

In July 2024, the European Union reported a significant increase in olive oil fraud and mislabeling cases. The European Commission's annual report on food fraud revealed that olive oil remained one of the most frequently adulterated food products, with incidents reaching a record high. ^[96]

Mislabeling and adulteration

The most common forms of olive oil fraud included:

1. Mislabeling lower-grade oils as extra virgin olive oil
2. Diluting olive oil with cheaper vegetable oils
3. Falsely claiming EU origin for non-EU oils

These fraudulent practices not only deceive consumers but also undermine the reputation of legitimate producers, particularly those from traditional olive-growing regions in the Mediterranean. ^[97]

EU response

To combat the rising fraud cases, the European Union has implemented several measures:

• Increased inspections and testing of olive oil shipments
• Enhanced traceability requirements for producers and distributors
• Stricter penalties for companies found guilty of fraud
• Improved cooperation between member states' food safety authorities

The EU has also launched a public awareness campaign to educate consumers about olive oil quality and how to identify authentic products. ^[98]

Impact on the industry

The surge in fraud cases has led to:

• Higher production costs for honest producers due to increased compliance requirements
• Potential market share loss for authentic extra virgin olive oil as cheaper, adulterated products flood the market
• Growing consumer skepticism about olive oil quality claims

Industry experts stress the importance of supporting reputable producers and urge consumers to be more vigilant when purchasing olive oil, particularly when prices seem unusually low for claimed quality. ^[99]

Constituents

General chemical structure of food fats (triglyceride). R , R and R are alkyl groups (approx. 20%) or alkenyl groups (approx. 80%).

Olive oil is composed mainly of the mixed triglyceride esters of oleic acid, linoleic acid, palmitic acid and of other fatty acids, ^{[100] [101]} along with traces of squalene (up to 0.7%) and sterols (about 0.2% phytosterol and tocosterols). The composition varies by cultivar, region, altitude, time of harvest, and extraction process.

Fatty acid	Type	Percentage (m/m methyl esters)	ref.
Oleic acid	Monounsaturated	55 to 83%	[100]
Linoleic acid	Polyunsaturated (omega-6)	3.5 to 21%	[100] [101]
Palmitic acid	Saturated	7.5 to 20%	[100]
Stearic acid	Saturated	0.5 to 5%	[100]
α-Linolenic acid	Polyunsaturated (omega-3)	0 to 1.5%	[100]

Comparison to other vegetable oils

Properties of vegetable oils ^{[102] [103]}
The nutritional values are expressed as percent (%) by mass of total fat.

Type	Processing treatment [104]	Saturated fatty acids	Monounsaturated fatty acids		Polyunsaturated fatty acids				Smoke point
			Total [102]	Oleic acid (ω−9)	Total [102]	α-Linolenic acid (ω−3)	Linoleic acid (ω−6)	ω−6:3 ratio
Avocado [105]		11.6	70.6	52–66 [106]	13.5	1	12.5	12.5:1	250 °C (482 °F) [107]
Brazil nut [108]		24.8	32.7	31.3	42.0	0.1	41.9	419:1	208 °C (406 °F) [109]
Canola [110]		7.4	63.3	61.8	28.1	9.1	18.6	2:1	204 °C (400 °F) [111]
Coconut [112]		82.5	6.3	6	1.7	0.019	1.68	88:1	175 °C (347 °F) [109]
Corn [113]		12.9	27.6	27.3	54.7	1	58	58:1	232 °C (450 °F) [111]
Cottonseed [114]		25.9	17.8	19	51.9	1	54	54:1	216 °C (420 °F) [111]
Cottonseed [115]	hydrogenated	93.6	1.5		0.6	0.2	0.3	1.5:1
Flaxseed/linseed [116]		9.0	18.4	18	67.8	53	13	0.2:1	107 °C (225 °F)
Grape seed		10.4	14.8	14.3	74.9	0.15	74.7	very high	216 °C (421 °F) [117]
Hemp seed [118]		7.0	9.0	9.0	82.0	22.0	54.0	2.5:1	166 °C (330 °F) [119]
High-oleic safflower oil [120]		7.5	75.2	75.2	12.8	0	12.8	very high	212 °C (414 °F) [109]
Olive (extra virgin) [121]		13.8	73.0	71.3	10.5	0.7	9.8	14:1	193 °C (380 °F) [109]
Palm [122]		49.3	37.0	40	9.3	0.2	9.1	45.5:1	235 °C (455 °F)
Palm [123]	hydrogenated	88.2	5.7		0
Peanut [124]		16.2	57.1	55.4	19.9	0.318	19.6	61.6:1	232 °C (450 °F) [111]
Rice bran oil		25	38.4	38.4	36.6	2.2	34.4 [125]	15.6:1	232 °C (450 °F) [126]
Sesame [127]		14.2	39.7	39.3	41.7	0.3	41.3	138:1
Soybean [128]		15.6	22.8	22.6	57.7	7	51	7.3:1	238 °C (460 °F) [111]
Soybean [129]	partially hydrogenated	14.9	43.0	42.5	37.6	2.6	34.9	13.4:1
Sunflower [130]		8.99	63.4	62.9	20.7	0.16	20.5	128:1	227 °C (440 °F) [111]
Walnut oil [131]	unrefined	9.1	22.8	22.2	63.3	10.4	52.9	5:1	160 °C (320 °F) [132]

Phenolic composition

Olive oil contains traces of phenolics (about 0.5%), such as esters of tyrosol, hydroxytyrosol, oleocanthal and oleuropein, ^{[64] [133]} which give extra virgin olive oil its bitter, pungent taste, and are also implicated in its aroma. ^[134] Olive oil is a source of at least 30 phenolic compounds, among which are elenolic acid, a marker for maturation of olives, ^{[64] [135]} and alpha-tocopherol, one of the eight members of the Vitamin E family. ^[136] Oleuropein, together with other closely related compounds such as 10-hydroxyoleuropein, ligstroside and 10-hydroxyligstroside, are tyrosol esters of elenolic acid.

Other phenolic constituents include flavonoids, lignans and pinoresinol. ^{[137] [138]}

Nutrition

Olive oil

Nutritional value per 100 g (3.5 oz)
Energy	3,700 kJ (880 kcal)
Carbohydrates	0 g
Fat	100 g
Saturated	13.8 g
Monounsaturated	73 g
Polyunsaturated omega−3 omega−6	10.5 g 0.8 g 9.8 g
Protein	0 g
Vitamins and minerals Vitamins Quantity %DV† Vitamin E 96% 14.4 mg Vitamin K 50% 60.2 μg
Other constituents	Quantity
Water	0 g
Full Link to USDA Database entry
†Percentages estimated using US recommendations for adults, [139] except for potassium, which is estimated based on expert recommendation from the National Academies. [140]

Olive oil is 100% fat, containing no carbohydrates, dietary fiber, protein or water (table).

In a reference amount of 100 grams (3.5 oz), olive oil supplies 884 calories of food energy, and is a rich source (20% or more of the Daily Value, DV) of vitamin E (96% DV) and vitamin K (57% DV) (table).

One tablespoon (13.5 g) of olive oil supplies 500 kJ (119 kcal) of food energy and contains 13.5 g of fat, including 9.9 g of monounsaturated fat (mainly as oleic acid), 1.4 g of polyunsaturated fat (mainly as linoleic acid), and 1.9 g of saturated fat (mainly as palmitic acid). ^[141]

Potential health effects

Egyptian olives

See also: Mediterranean diet

In the United States, the FDA allows producers of olive oil to place the following qualified health claim on product labels: ^{[142] [143]}

Limited and not conclusive scientific evidence suggests that eating about 2 tbsp. (23 g) of olive oil daily may reduce the risk of coronary heart disease due to the monounsaturated fat in olive oil. To achieve this possible benefit, olive oil is to replace a similar amount of saturated fat and not increase the overall number of calories consumed in a day.

In a review by the European Food Safety Authority (EFSA) in 2011, health claims on olive oil were approved for protection by its polyphenols against oxidation of blood lipids, ^[144] and for maintenance of normal blood LDL-cholesterol levels by replacing saturated fats in the diet with oleic acid. ^[145] (See also: Commission Regulation (EU) 432/2012 of 16 May 2012). ^[146] Despite its approval, the EFSA has noted that a definitive cause-and-effect relationship has not been adequately established for consumption of olive oil and maintaining normal (fasting) blood concentrations of triglycerides, normal blood HDL-cholesterol concentrations, and normal blood glucose concentrations. ^[147]

A 2014 meta-analysis concluded that increased consumption of olive oil was associated with reduced risk of all-cause mortality, cardiovascular events and stroke, while monounsaturated fatty acids of mixed animal and plant origin showed no significant effects. ^[148] Another meta-analysis in 2018 found high-polyphenol olive oil intake was associated with improved measures of total cholesterol, HDL cholesterol, malondialdehyde, and oxidized LDL when compared to low-polyphenol olive oils, although it recommended longer studies, and more investigation of non-Mediterranean populations. ^[149]

See also

• Food portal

• Amurca
• List of ancient dishes and foods
• List of cuisines
• List of dips

References

1. Gray, Sarah (2015). "Cooking with extra virgin olive oil". ACNEM Journal. 34 (2): 8–12. S2CID   132454216.
2. De Alzaa, F.; Guillaume, C.; Ravetti, L. (June 2018). "Evaluation of Chemical and Physical Changes in Different Commercial Oils during Heating". Acta Scientific Nutritional Health. 2 (6): 2–11. Archived from the original on May 6, 2021. Retrieved May 6, 2021.
3. "United States Department of Agriculture: "Grading Manual for Olive Oil and Olive-Pomace Oil"". Archived from the original on October 31, 2014. Retrieved June 25, 2013.
4. Davidson, Alan (1999). The Oxford Companion to Food. Oxford University Press. s.v. Olives. ISBN   0-19-211579-0.
5. "International Olive Council". Archived from the original on October 26, 2018. Retrieved October 5, 2011.
6. Scanlon, Thomas F. (2005). "The Dispersion of Pederasty and the Athletic Revolution in sixth-century BC Greece", in Same-Sex Desire and Love in Greco-Roman Antiquity and in the Classical Tradition of the West, ed. B.C. Verstraete and V. Provençal, Harrington Park Press.
7. Kennell, Nigel M. "Most Necessary for the Bodies of Men: Olive Oil and its By-products in the Later Greek Gymnasium" in Mark Joyal (ed.), In Altum: Seventy-Five Years of Classical Studies in Newfoundland, 2001; popis pp. 119–133.
8. Himes, Norman E. (1963). The Medical History of Contraception. Gamut Press. pp. 86–87.
9. Kapellakis, Iosif Emmanouil (2008). "Olive oil history, production and by-product management". Reviews in Environmental Science and Bio/Technology. 7 (1): 1–26. Bibcode:2008RESBT...7....1K. doi:10.1007/s11157-007-9120-9. S2CID   84992505.
10. Foley, B. P.; Hansson, M. C.; Kourkoumelis, D. P.; & Theodoulou, T. A. (2012). "Aspects of ancient Greek trade re-evaluated with amphora DNA evidence". Journal of Archaeological Science, 39(2), 389-398.
11. Riley, F. R. "Olive Oil Production on Bronze Age Crete: Nutritional properties, Processing methods, and Storage life of Minoan olive oil". Oxford Journal of Archaeology21:1:63–75 (2002).
12. Hadjisavvas, Sophocles; Chaniotis, Angelos (2012). "Wine and olive oil in Crete and Cyprus: socio-economic aspects". British School at Athens Studies. 20: 157–173. ISSN   2159-4996. JSTOR   23541207.
13. Besnarda, Guillaume; André Bervillé, "Multiple origins for Mediterranean olive (Olea europaea L. ssp. europaea) based upon mitochondrial DNA polymorphisms", Comptes Rendus de l'Académie des Sciences – Series III – Sciences de la Vie323:2:173–181 (February 2000); Breton, Catherine; Michel Tersac and André Bervillé, "Genetic diversity and gene flow between the wild olive (oleaster, Olea europaea L.) and the olive: several Plio-Pleistocene refuge zones in the Mediterranean basin suggested by simple sequence repeats analysis", Journal of Biogeography33:11:1916 (November 2006).
14. Schuster, Ruth (December 17, 2014). "8,000-year old olive oil found in Galilee, earliest known in world". Haaretz. Archived from the original on February 7, 2018. Retrieved December 17, 2014.
15. Galili, Ehud; Stanley, Daniel Jean; Sharvit, Jacob; Weinstein-Evron, Mina (December 1997). "Evidence for Earliest Olive-Oil Production in Submerged Settlements off the Carmel Coast, Israel". Journal of Archaeological Science. 24 (12): 1141–1150. Bibcode:1997JArSc..24.1141G. doi:10.1006/jasc.1997.0193.
16. Brown, Nathaniel R. (June 11, 2011). "By the Rivers of Babylon: The Near Eastern Background and Influence on the Power Structures Ancient Israel and Judah" (PDF). history.ucsc.edu. Archived from the original (PDF) on August 10, 2014. Retrieved July 30, 2014.
17. Gardiner, Alan H. (1916). Notes on the Story of Sinuhe. Paris: Librairie Honoré Champion. Archived from the original on April 2, 2019. Retrieved December 28, 2008.
18. Riley, F.R. (February 1, 2002). "Olive oil production on bronze age Crete: nutritional properties, processing methods and storage life of Minoan olive oil". Oxford Journal of Archaeology. 21 (1): 63–75. doi:10.1111/1468-0092.00149. ISSN   0262-5253.
19. Castleden, Rodney (2005). The Mycenaeans. London and New York: Routledge. p. 107. ISBN   978-0-415-36336-5. Archived from the original on January 15, 2023. Retrieved April 3, 2016. Huge quantities of olive oil were produced and it must have been a major source of wealth. The simple fact that southern Greece is far more suitable climatically for olive production may explain why the Mycenaean civilization made far greater advances in the south than in the north. The oil had a variety of uses, in cooking, as a dressing, as soap, as lamp oil, and as a base for manufacturing unguents.
20. Blázquez, J. M. (October 1992). "The Latest Work on the Export of Baetican Olive Oil to Rome and the Army". Greece and Rome. 39 (2): 173–188. doi:10.1017/S0017383500024153.
21. Nicole Sturzenberger (2007). "Olive Processing Waste Management: Summary" (PDF). oliveoil.ucdavis.edu. Archived from the original (PDF) on August 8, 2014. Retrieved July 30, 2014.
22. Essid, Mohamed Yassine (2012). "Chapter 2. History of Mediterranean Food". MediTerra: The Mediterranean Diet for Sustainable Regional Development. Presses de Sciences Po. pp. 51–69. ISBN   978-2724612486. Archived from the original on May 11, 2021. Retrieved May 12, 2016.
23. "Olive oil: Refined olive oils". www.accc.gov.au. Archived from the original on July 19, 2018. Retrieved July 19, 2018.
24. Peri, Claudio, ed. (2014). The extra virgin olive oil handbook. Chichester, West Sussex, UK: John Wiley & Sons, Ltd. p. 356. ISBN   9781118460436. OCLC   861120215.
25. Gritzer, Daniel (May 15, 2023). "Cooking With Olive Oil: Should You Fry and Sear in It or Not?". Serious Eats . Archived from the original on May 18, 2024. Retrieved June 24, 2024.
26. McManus, Lisa (August 2, 2023). "Olive Oil 101: How to Shop". America's Test Kitchen . Archived from the original on March 30, 2024. Retrieved June 24, 2024.
27. Oaks, Dallin H. "Healing the Sick". ChurchofJesusChrist.org. Archived from the original on August 28, 2019. Retrieved July 16, 2019.
28. Babylonian Talmud, Menachot 85b
29. Eisenberg, Ronald L. Dictionary of Jewish Terms: A Guide to the Language of Judaism, ISBN   1589797299, 2011, p. 299.
30. "Soap Making from Scratch Workshop". Archived from the original on November 20, 2013. Retrieved November 23, 2013.
31. "The olive essence". Archived from the original on December 3, 2013. Retrieved November 23, 2013.
32. "Castile Olive Oil Soap, Spain, 2000 BCE". smith.edu. Archived from the original on July 19, 2018. Retrieved July 30, 2014.
33. "Synthesis of Soap from Olive Oil" (PDF). webpages.uidaho.edu. 2010. Archived (PDF) from the original on July 19, 2018. Retrieved July 30, 2014.
34. "California olive oil is worth the splurge". ucanr.edu (Division of Agriculture and Natural Resources). Archived from the original on July 19, 2018. Retrieved July 30, 2014.
35. Sapra, Sameer; Rogach, Andrey L.; Feldmann, Jochen (2006). "Phosphine-free synthesis of monodisperse CdSe nanocrystals in olive oil". Journal of Materials Chemistry. 16 (33): 3391. doi:10.1039/B607022A.
36. "What's the Difference Between Extra Virgin & Regular Olive Oil?". OliveOil.com. May 4, 2021. Archived from the original on May 24, 2021. Retrieved May 24, 2021.
37. Peri, Claudio, ed. (2014). The extra-virgin olive oil handbook. Chichester, West Sussex, UK: John Wiley & Sons. pp. 155–156. ISBN   9781118460450. OCLC   908158600.
38. Danby, H., ed. (1933). "Menahoth". The Mishnah. Oxford: Oxford University Press. 8:4 (p. 502). ISBN   0-19-815402-X.
39. Amar, Z. (2015). Flora and Fauna in Maimonides' Teachings (in Hebrew). Kfar Darom. p. 73. OCLC   783455868.
40. Geoponika – Agricultural Pursuits. Vol. 1. Translated by Owen, T. London: University of Oxford. 1805. pp.  288–289.
41. Cf. Danby, H., ed. (1933). "Tohoroth". The Mishnah. Oxford: Oxford University Press. 9:5 (p. 729). ISBN   0-19-815402-X.
42. Amar, Z. (2015). Flora and Fauna in Maimonides' Teachings (in Hebrew). Kfar Darom. p. 74. OCLC   783455868. s.v. Mishnah Tohoroth 9:1 (Maimonides' commentary)
43. Frankel, Rafael (1994). "Ancient Oil Mills and Presses in the Land of Israel". In Etan Ayalon (ed.). History and Technology of Olive Oil in the Holy Land. Translated by Jacobson, Jay C. Tel Aviv, Israel: Eretz Israel Museum and Oléarus editions. p. 23. ISBN   0-917526-06-6.
44. Mukaddasi (1906) [3rd edition 1967]. de Goeje, M. J. (ed.). Kitāb Aḥsan at-taqāsīm fī maʻrifat al-aqālīm[The Best Divisions for Knowledge of the Regions] (in Arabic). Leiden: Brill. p. 181. OCLC   313566614.^{[ clarification needed ]}
45. Amar, Z.; Serri, Yaron (2004). The Land of Israel and Syria as Described by al-Tamimi – Jerusalem Physician of the 10th Century (in Hebrew). Ramat-Gan. p. 78. ISBN   965-226-252-8. OCLC   607157392. Cf. Babylonian Talmud, Menahot 86a, where it says that the olives used to produce this kind of oil had not reached one-third of its natural stage of ripeness, and that it was used principally as a depilatory and to flavor meat.
46. Berbel, Julio; Posadillo, Alejandro (January 17, 2018). "Review and Analysis of Alternatives for the Valorisation of Agro-Industrial Olive Oil By-Products". Sustainability. 10 (1): 237. doi: 10.3390/su10010237 . hdl: 10396/17426 . ISSN   2071-1050.
47. "International Olive Oil Council" (PDF). November 2023.
48. "International Olive Oil Council" (PDF). November 2023.
49. "The World of Olive Oil". January 13, 2022. Archived from the original on February 25, 2023. Retrieved February 25, 2023.
50. Vivante, Lucy (November 2, 2011). "Gruppo Pieralisi Powers World's Largest Olive Oil Mill in Jaén". Olive Oil Times. Archived from the original on November 17, 2015. Retrieved November 9, 2015.
51. "Tuscan Extra Virgin Olive Oil: A Product of Excellence". www.discovertuscany.com. Archived from the original on July 30, 2018. Retrieved July 30, 2018.
52. "Associazione Nazionale Città dell'Olio – Citta dell'olio". Archived from the original on July 30, 2018. Retrieved July 30, 2018.
53. "La marca Italia se queda con el aceite español. Noticias de Economía". El Confidencial (in Spanish). Archived from the original on October 19, 2017. Retrieved October 19, 2017.
54. "Olive Oil Consumption". North American Olive Oil Association. Archived from the original on April 6, 2023. Retrieved April 6, 2023.
55. "Ministry of Agriculture in Olive Oil sector analysis: The Israeli farmer produces more olive oil and the Israeli public consumes more and pays less money for it". GOV.IL. Archived from the original on April 9, 2022. Retrieved May 8, 2022.
56. "Olive Oil Times". Archived from the original on October 21, 2013. Retrieved September 13, 2014.
57. "New U.S. Olive Oil Standards in Effect Today". Olive Oil Times. October 25, 2010. Archived from the original on February 6, 2017. Retrieved September 13, 2014.
58. Durant, John (September 5, 2000). "U.S. Customs Department, Director Commercial Rulings Division – Country of origin marking of imported olive oil; 19 CFR 134.46; "imported by" language". Archived from the original on January 16, 2009. Retrieved October 15, 2008.
59. "Reference to HQ 560944 ruling of the Customs and Border Protection (CBP) on April 27, 1999 blending of Spanish olive oil with Italian olive oil in Italy does not result in a substantial transformation of the Spanish product". United States International Trade Commission Rulings. February 28, 2006. Archived from the original on February 11, 2017. Retrieved October 15, 2008.
60. McGee, Dennis. "Deceptive Olive Oil Labels on Major Brands (includes photos)". Archived from the original on February 6, 2009. Retrieved November 9, 2008.
61. Francis, Raymond (1998). "The Olive Oil Scandal" (PDF). beyondhealth.com. Archived from the original (PDF) on December 27, 2010. Retrieved June 7, 2010.
62. Grossi, Marco; Lecce, Giuseppe Di; Toschi, Tullia Gallina; Ricco, Bruno (September 2014). "Fast and Accurate Determination of Olive Oil Acidity by Electrochemical Impedance Spectroscopy" (PDF). IEEE Sensors Journal. 14 (9): 2947–2954. Bibcode:2014ISenJ..14.2947G. doi:10.1109/JSEN.2014.2321323.
63. Grossi, Marco; Di Lecce, Giuseppe; Arru, Marco; Gallina Toschi, Tullia; Riccò, Bruno (February 2015). "An opto-electronic system for in-situ determination of peroxide value and total phenol content in olive oil" (PDF). Journal of Food Engineering. 146: 1–7. doi:10.1016/j.jfoodeng.2014.08.015.
64. Bendini, Alessandra; Cerretani, Lorenzo; Carrasco-Pancorbo, Alegria; Gómez-Caravaca, Ana Maria; Segura-Carretero, Antonio; Fernández-Gutiérrez, Alberto; Lercker, Giovanni (August 6, 2007). "Phenolic Molecules in Virgin Olive Oils: a Survey of Their Sensory Properties, Health Effects, Antioxidant Activity and Analytical Methods. An Overview of the Last Decade Alessandra". Molecules. 12 (8): 1679–1719. doi: 10.3390/12081679 . PMC   6149152 . PMID   17960082.
65. "The 101 of olive oil designations and definitions". Australian Olive Association. Archived from the original on February 26, 2015. Retrieved March 15, 2015.
66. "Designations and definitions of olive oils". International Olive Council. Archived from the original on December 3, 2018. Retrieved December 1, 2012.
67. "What is extra virgin olive oil?". Olive Oil Times. 2018. Archived from the original on February 9, 2018. Retrieved February 8, 2018.
68. "Olive Oil Production". Prosodol. Archived from the original on November 19, 2011. Retrieved November 27, 2016.
69. "United States Standard for Grades of Olive Oil". United States Department of Agriculture. Archived from the original on November 11, 2018. Retrieved January 20, 2016.
70. "United States Standard for Grades of Olive Oil" (PDF). United States Department of Agriculture. Archived (PDF) from the original on May 16, 2017. Retrieved January 20, 2016.
71. "Olive Oil Standards in the US: An Overview". oliveoil.com. May 18, 2021. Archived from the original on May 24, 2021. Retrieved September 1, 2021.
72. NAOOA. "NAOOA Certified Quality Seal Program". www.aboutoliveoil.org. Archived from the original on January 3, 2020. Retrieved January 3, 2020.
73. "Certification Process". California Olive Oil Council. Archived from the original on January 3, 2020. Retrieved January 3, 2020.
74. "What Makes Olive Oil Extra Virgin and Can I Trust the Label?". FoodPrint. December 16, 2019. Archived from the original on January 3, 2020. Retrieved January 3, 2020.
75. "Bone density scan ... Olive oil ... Bursitis". Women's Health Advisor. 14 (7): 8. 2010.^{[ unreliable medical source? ]}
76. Bogle, Deborah; Mueller, Tom (May 12, 2012). "Losing our Virginity". The Advertiser . pp. 11–14.
77. Williams, Daniel (September 9, 2010). "Olive pomace oil: not what you might think". Olive Oil Times. Archived from the original on April 23, 2019. Retrieved March 15, 2019.
78. "California Olive Ranch". Archived from the original on November 17, 2015. Retrieved September 13, 2014.
79. Προϊόντα Προστατευόμενης Ονομασίας Προέλευσης και Προστατευόμενης Γεωγραφικής Ένδειξης [Protected Designation of Origin and Protected Geographical Indication] (in Greek). Archived from the original on July 21, 2011. Retrieved May 9, 2011.
80. Drummond, Linda. Sunday Telegraph (Australia), October 17, 2010 Sunday, Features; p. 10.
81. "Report Scusi, Lei E' Vergine?". rai.it. Archived from the original on November 6, 2013. Retrieved July 7, 2013.
82. Mueller, Tom (August 13, 2007). "Slippery Business". The New Yorker. Archived from the original on June 13, 2007. Retrieved January 28, 2016.
83. "EUbusiness.com". Archived from the original on March 9, 2008.
84. Moore, Malcolm (May 7, 2007). "Murky Italian olive oil to be pored over". The Daily Telegraph. London. Archived from the original on May 9, 2007. Retrieved May 20, 2010.
85. "草刈りは定期的に". Novaoliva.com. February 21, 2013. Archived from the original on November 17, 2015. Retrieved May 21, 2013.
86. Moore, Malcolm (March 5, 2008). "Italian police crack down on olive oil fraud". The Telegraph.
87. Pisa, Nick (April 22, 2008). "Forty arrested in new 'fake' olive oil scam". The Scotsman. Edinburgh. Archived from the original on January 9, 2009. Retrieved April 22, 2008.
88. "Investigations Into Deodorized Olive Oils". Olive Oil Times. March 29, 2011. Archived from the original on November 7, 2017. Retrieved September 13, 2014.
89. "Spanish Police Say Palm, Avocado, Sunflower Was Passed Off as Olive Oil". Olive Oil Times. February 14, 2012. Archived from the original on February 6, 2017. Retrieved April 5, 2012.
90. Nadeau, Barbie Latza (November 14, 2015). "Has the Italian Mafia Sold You Fake Extra Virgin Olive Oil?". The Daily Beast. Archived from the original on November 18, 2015. Retrieved November 17, 2015.
91. Whitaker, Bill (January 3, 2016). "Agromafia". CBS News.
92. "Mafia Control of Olive Oil the Topic of '60 Minutes' Report". Olive Oil Times. January 3, 2016. Archived from the original on November 9, 2018. Retrieved January 28, 2016.. Summary of CBS video
93. "Italy Arrests 33 Accused of Olive Oil Fraud 16 February 2017". February 16, 2017. Archived from the original on September 20, 2018. Retrieved September 19, 2018.
94. "Don't fall victim to olive oil fraud 3 January 2016". CBS News . January 3, 2016. Archived from the original on September 20, 2018. Retrieved September 19, 2018.
95. "The Olive Oil Scam: If 80% Is Fake, Why Do You Keep Buying It? 10 February 2016". Forbes . Archived from the original on September 20, 2018. Retrieved September 19, 2018.
96. Goodier, Michael (July 29, 2024). "Olive oil fraud and mislabelling cases hit record high in EU". The Guardian. ISSN   0261-3077 . Retrieved December 12, 2024.
97. Goodier, Michael (July 29, 2024). "Olive oil fraud and mislabelling cases hit record high in EU". The Guardian. ISSN   0261-3077 . Retrieved December 12, 2024.
98. Goodier, Michael (July 29, 2024). "Olive oil fraud and mislabelling cases hit record high in EU". The Guardian. ISSN   0261-3077 . Retrieved December 12, 2024.
99. Goodier, Michael (July 29, 2024). "Olive oil fraud and mislabelling cases hit record high in EU". The Guardian. ISSN   0261-3077 . Retrieved December 12, 2024.
100. Boskou, Dimitrios; Blekas, Georgios; Tsimidou, Maria (April 2006). "4 Olive Oil Composition". Olive Oil. p. 42. doi:10.1201/9781439832028.pt2 (inactive November 12, 2024). ISBN   978-1-893997-88-2 . Retrieved March 5, 2022.
101. Beltrán, Gabriel; del Rio, Carmen; Sánchez, Sebastián; Martínez, Leopoldo (June 2004). "Influence of Harvest Date and Crop Yield on the Fatty Acid Composition of Virgin Olive Oils from Cv. Picual". Journal of Agricultural and Food Chemistry. 52 (11): 3434–3440. doi:10.1021/jf049894n. PMID   15161211.
102. "US National Nutrient Database, Release 28". United States Department of Agriculture. May 2016. All values in this table are from this database unless otherwise cited or when italicized as the simple arithmetic sum of other component columns.
103. "Fats and fatty acids contents per 100 g (click for "more details"). Example: Avocado oil (user can search for other oils)". Nutritiondata.com, Conde Nast for the USDA National Nutrient Database, Standard Release 21. 2014. Retrieved September 7, 2017. Values from Nutritiondata.com (SR 21) may need to be reconciled with most recent release from the USDA SR 28 as of Sept 2017.
104. "USDA Specifications for Vegetable Oil Margarine Effective August 28, 1996" (PDF).
105. "Avocado oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
106. Ozdemir, Feramuz; Topuz, Ayhan (June 2004). "Changes in dry matter, oil content and fatty acids composition of avocado during harvesting time and post-harvesting ripening period". Food Chemistry. 86 (1): 79–83. doi:10.1016/j.foodchem.2003.08.012.
107. Wong M, Requejo-Jackman C, Woolf A (April 2010). "What is unrefined, extra virgin cold-pressed avocado oil?". Aocs.org. The American Oil Chemists' Society. Retrieved December 26, 2019.
108. "Brazil nut oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
109. Katragadda, Harinageswara Rao; Fullana, Andrés; Sidhu, Sukh; Carbonell-Barrachina, Ángel A. (May 2010). "Emissions of volatile aldehydes from heated cooking oils". Food Chemistry. 120 (1): 59–65. doi:10.1016/j.foodchem.2009.09.070.
110. "Canola oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
111. Wolke RL (May 16, 2007). "Where There's Smoke, There's a Fryer". The Washington Post. Retrieved March 5, 2011.
112. "Coconut oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
113. "Corn oil, industrial and retail, all purpose salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
114. "Cottonseed oil, salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
115. "Cottonseed oil, industrial, fully hydrogenated, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
116. "Linseed/Flaxseed oil, cold pressed, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
117. Garavaglia J, Markoski MM, Oliveira A, Marcadenti A (2016). "Grape Seed Oil Compounds: Biological and Chemical Actions for Health". Nutrition and Metabolic Insights. 9: 59–64. doi:10.4137/NMI.S32910. PMC   4988453 . PMID   27559299.
118. Callaway, James; Schwab, Ursula; Harvima, Ilkka; Halonen, Pirjo; Mykkänen, Otto; Hyvönen, Pekka; Järvinen, Tomi (April 2005). "Efficacy of dietary hempseed oil in patients with atopic dermatitis". Journal of Dermatological Treatment. 16 (2): 87–94. doi:10.1080/09546630510035832. PMID   16019622.
119. Melina V. "Smoke points of oils" (PDF). veghealth.com. The Vegetarian Health Institute.
120. "Safflower oil, salad or cooking, high oleic, primary commerce, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
121. "Olive oil, salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
122. "Palm oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
123. "Palm oil, industrial, fully hydrogenated, filling fat, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
124. "Oil, peanut". FoodData Central. usda.gov.
125. Orthoefer, Frank T. (2020). "Rice Bran Oil". Bailey's Industrial Oil and Fat Products. pp. 1–25. doi:10.1002/047167849X.bio015.pub2. ISBN   978-0-471-38460-1.
126. "Rice bran oil". RITO Partnership. Retrieved January 22, 2021.
127. "Oil, sesame, salad or cooking". FoodData Central. fdc.nal.usda.gov. April 1, 2019.
128. "Soybean oil, salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
129. "Soybean oil, salad or cooking, (partially hydrogenated), fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved September 6, 2017.
130. "FoodData Central". fdc.nal.usda.gov.
131. "Walnut oil, fat composition, 100 g". US National Nutrient Database, United States Department of Agriculture.
132. "Smoke Point of Oils". Baseline of Health. Jonbarron.org.
133. Tripoli, Elisa; Giammanco, Marco; Tabacchi, Garden; Di Majo, Danila; Giammanco, Santo; La Guardia, Maurizio (2005). "The phenolic compounds of olive oil: structure, biological activity and beneficial effects on human health". Nutrition Research Reviews. 18 (1): 98–112. doi: 10.1079/NRR200495 . PMID   19079898. S2CID   221216561.
134. Genovese, Alessandro; Caporaso, Nicola; Villani, Veronica; Paduano, Antonello; Sacchi, Raffaele (August 2015). "Olive oil phenolic compounds affect the release of aroma compounds". Food Chemistry. 181: 284–294. doi:10.1016/j.foodchem.2015.02.097. PMID   25794752.
135. Lozano-Sánchez, Jesús; Castro-Puyana, María; Mendiola, Jose; Segura-Carretero, Antonio; Cifuentes, Alejandro; Ibáez, Elena (September 15, 2014). "Recovering Bioactive Compounds from Olive Oil Filter Cake by Advanced Extraction Techniques". International Journal of Molecular Sciences. 15 (9): 16270–16283. doi: 10.3390/ijms150916270 . PMC   4200768 . PMID   25226536.
136. Wagner KH, Kamal-Eldin A, Elmadfa I (2004). "Gamma-tocopherol--an underestimated vitamin?". Annals of Nutrition & Metabolism. 48 (3): 169–88. doi:10.1159/000079555. PMID   15256801. S2CID   24827255. In North America, the intake of γ-tocopherol has been estimated to exceed that of α-tocopherol by a factor of 2–4 ... due to the fact that soybean oil is the predominant vegetable oil in the American diet (76.4%) followed by corn oil and canola oil (both 7%) ... The supply of dietary fats ... is much more diverse in Europe ... The oils mainly consumed in Europe, i.e. sunflower, olive and canola oil, provide less γ-tocopherol but more α-tocopherol ... [T]he ratio of α-:γ-tocopherol is at least 1:2. Therefore, the average γ-tocopherol intake can be estimated as 4–6 mg/day, which is about 25–35% of the USA intake. In accordance with the lower estimated European intake of γ-tocopherol, the serum levels of γ-tocopherol in European populations are 4–20 times lower than that of α-tocopherol
137. Owen, R.W; Giacosa, A; Hull, W.E; Haubner, R; Spiegelhalder, B; Bartsch, H (June 2000). "The antioxidant/anticancer potential of phenolic compounds isolated from olive oil". European Journal of Cancer. 36 (10): 1235–1247. doi:10.1016/S0959-8049(00)00103-9. PMID   10882862.
138. Owen, Robert W; Mier, Walter; Giacosa, Attilio; Hull, William E; Spiegelhalder, Bertold; Bartsch, Helmut (July 2000). "Identification of Lignans as Major Components in the Phenolic Fraction of Olive Oil". Clinical Chemistry. 46 (7): 976–988. doi:10.1093/clinchem/46.7.976. PMID   10894841.
139. United States Food and Drug Administration (2024). "Daily Value on the Nutrition and Supplement Facts Labels". FDA. Archived from the original on March 27, 2024. Retrieved March 28, 2024.
140. National Academies of Sciences, Engineering, and Medicine; Health and Medicine Division; Food and Nutrition Board; Committee to Review the Dietary Reference Intakes for Sodium and Potassium (2019). "Chapter 4: Potassium: Dietary Reference Intakes for Adequacy". In Oria, Maria; Harrison, Meghan; Stallings, Virginia A. (eds.). Dietary Reference Intakes for Sodium and Potassium. The National Academies Collection: Reports funded by National Institutes of Health. Washington, DC: National Academies Press (US). pp. 120–121. doi:10.17226/25353. ISBN   978-0-309-48834-1. PMID   30844154 . Retrieved December 5, 2024.
141. "Nutrient composition for a tablespoon of olive oil; 13.5 g from the pick list for portion". USDA FoodData Central. April 1, 2019. Retrieved December 26, 2023.
142. "FDA Allows Qualified Health Claim to Decrease Risk of Coronary Heart Disease". US Food and Drug Administration. November 2004. Archived from the original on March 10, 2017. Retrieved April 5, 2013.
143. Brackett, R. E. (November 2004). "Letter Responding to Health Claim Petition dated August 28, 2003: Monounsaturated Fatty Acids from Olive Oil and Coronary Heart Disease (Docket No 2003Q-0559)". US Food and Drug Administration. Archived from the original on June 3, 2013. Retrieved April 5, 2013.
144. European Food Safety Authority (2011). "Scientific Opinion on the substantiation of health claims related to polyphenols in olive". EFSA Journal. 9 (4): 2033. doi: 10.2903/j.efsa.2011.2033 .
145. European Food Safety Authority (2011). "Scientific Opinion on the substantiation of health claims related to oleic acid intended to replace saturated fatty acids (SFAs) in foods or diets". EFSA Journal. 9 (4): 2043. doi: 10.2903/j.efsa.2011.2043 .
146. "Commission Regulation (EU) No 432/2012 of 16 May 2012 establishing a list of permitted health claims made on foods, other than those referring to the reduction of disease risk and to children's development and health. Text with EEA relevance". Official Journal of the European Union. Archived from the original on October 13, 2016. Retrieved August 31, 2016.
147. Scientific Committee/Scientific Panel of the European Food Safety Authority (2011). "Scientific Opinion on the substantiation of health claims related to olive oil and maintenance of normal blood LDL-cholesterol concentrations (ID 1316, 1332), maintenance of normal (fasting) blood concentrations of triglycerides (ID 1316, 1332), maintenance of normal blood HDL cholesterol concentrations (ID 1316, 1332) and maintenance of normal blood glucose concentrations (ID 4244) pursuant to Article 13(1) of Regulation (EC) No 1924/2006". EFSA Journal. 9 (4): 2044 [19 pp]. doi: 10.2903/j.efsa.2011.2044 . hdl: 2434/174506 .
148. Schwingshackl, L; Hoffmann, G. (2014). "Monounsaturated fatty acids, olive oil and health status: A systematic review and meta-analysis of cohort studies". Lipids in Health and Disease. 13 (1): 154. doi: 10.1186/1476-511X-13-154 . PMC   4198773 . PMID   25274026.
149. George, Elena S.; Marshall, Skye; Mayr, Hannah L; Trakman, Gina L.; Tatucu-Babet, Oana A.; Lassemillante, Annie-Claude M.; Bramley, Andrea; Reddy, Anjana J.; Forsyth, Adrienne; Tierney, Audrey C.; Thomas, Colleen J.; Itsiopoulos, Catherine; Marx, Wolfgang (September 25, 2019). "The effect of high-polyphenol extra virgin olive oil on cardiovascular risk factors: A systematic review and meta-analysis" (PDF). Critical Reviews in Food Science and Nutrition. 59 (17): 2772–2795. doi:10.1080/10408398.2018.1470491. PMID   29708409.

Further reading

• Caruso, Tiziano; Magnano di San Lio, Eugenio (eds.). La Sicilia dell'olio, Giuseppe Maimone Editore, Catania, 2008, ISBN   978-88-7751-281-9
• Mueller, Tom. Extra Virginity – The Sublime and Scandalous World of Olive Oil, Atlantic Books, London, 2012. ISBN   978-1-84887-004-8.
• Pagnol, Jean. L'Olivier, Aubanel, 1975. ISBN   2-7006-0064-9.
• Palumbo, Mary; Linda J. Harris (December 2011) "Microbiological Food Safety of Olive Oil: A Review of the Literature" (PDF), University of California, Davis
• Preedy, V. R.; Watson, R. R. (eds.). Olives and Olive Oil in Health and Disease Prevention, Academic Press, 2010. ISBN   978-0-12-374420-3.
• Rosenblum, Mort. Olives: The Life and Lore of a Noble Fruit, North Point Press, 1996. ISBN   0-86547-503-2.
• CODEX STAN 33-1981 Standard for Olive Oils and Olive Pomace Oils