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Diet sodas (also known as sugar-free sodas, zero-calorie sodas, low-calorie sodas or zero-sugar sodas) are soft drinks which contain little or no sugar or calories. First introduced onto the market in 1949, diet sodas are typically marketed for those with diabetes or who wish to reduce their sugar or caloric intake.
Though artificial sweeteners had been known since the discovery of saccharin in 1878, [1] the diet beverage era began in earnest with the 1949 launch of La Casera (also known as Gaseosa) in Madrid, Spain using cyclamate. The product, which belongs now to Suntory Beverage and Food Europe (SBFE), is still on the market. This was followed by the development of No-Cal ginger ale in 1952. Hyman and Morris Kirsch of Kirsch Beverages (Brooklyn, New York) formulated No-Cal for diabetic and otherwise sugar-restricted hospital patients, also using cyclamate calcium to replace the sugar. Recognizing Americans' growing desire for weight loss, Kirsch began marketing No-Cal to the general public, particularly to women. By 1953, the drink had become popular in New York City and the surrounding region. [2] Canada Dry followed with Canada Dry Glamor in 1954. [3]
In 1958, Royal Crown Cola introduced their own cyclamate and saccharin sweetened dietetic beverage, Diet Rite. Following highly successful trials in Chicago and North Carolina, RC began marketing Diet Rite nationwide for the general public in 1962. It shortly became the 4th-best selling soda in the US, behind only Coca-Cola, Pepsi, and RC Cola itself. [2]
The following year (1963), Dr Pepper released a diet version of its own soft drink, "Dietetic Dr. Pepper" (later renamed to Sugar Free Dr. Pepper, then Diet Dr. Pepper), although it sold slowly due to the misconception that it was meant solely for diabetic consumption. The same year, The Coca-Cola Company joined the diet soft drink market with Tab, followed up by Pepsi with Patio Diet Cola (shortly renamed to Diet Pepsi). Coca-Cola added Fresca in 1966.
All of the above products were originally sweetened with cyclamates and saccharin, which soon proved disastrous. In 1969, an experiment at the University of Wisconsin-Madison found that a cyclamate combination caused bladder cancer in laboratory rats, [4] quickly followed up by another from Abbott Labs (a manufacturer of cyclamate). This finding was quickly accepted in the medical field and by the public as evidence that cyclamate was carcinogenic in humans. [5] [6] Per the Delaney amendment, the FDA immediately announced a ban on cyclamate in food and drink products, to take effect in 1970. Diet sodas were quickly reformulated with saccharin alone (in the hopes that consumers would tolerate the metallic aftertaste), but the market share of diet sodas rapidly fell from 20% to 3% overall. [2] [7]
After further studies in the 1980s linked saccharin to cancer as well, most manufacturers switched to aspartame in 1983. [2] [8]
By the early 1990s, a wide array of companies had their own diet refreshments on supermarket shelves. Tab made a comeback during the late 1990s after new studies demonstrated that saccharin is not an important factor in the risk of cancer. Nevertheless, The Coca-Cola Company has maintained its 1984 reformulation, replacing some of the saccharin in Tab with NutraSweet.
By 2002, some beverage companies had diversified to include such flavors as vanilla and lemon among their products and diet drinks were soon being produced with those flavors as well (see Diet Vanilla Coke, Diet Pepsi Vanilla). By 2004, several alcohol companies had released sugar-free or "diet" alcoholic products too. [2]
Several different sweeteners are used to replace sugar in low-calorie diet beverages. The primary compounds worldwide are aspartame, saccharin, sucralose, cyclamates (outside the US), acesulfame potassium ("Ace K"), and stevia.
The ideal goal in artificial sweetening is to replicate the exact taste and texture effects of sucrose with one or more non-caloric sweeteners. Despite decades of research and development, this goal remains elusive. [9] [10] Most sweeteners carry a marked aftertaste, often described as "bitter" or "metallic". [9] [11] The perception of this aftertaste has been studied intensively, [12] [13] and appears to be based on genetic factors that vary from person to person. [9] [14]
In recent years, rising consumer preference for "natural" products and concern over the possible health effects of artificial sweeteners has spurred demand for stevia-based sweeteners and driven manufacturers to seek novel phytochemicals. [9] [11]
Aspartame, commonly known by the brand name NutraSweet, is one of the most commonly used artificial sweeteners. The 1982 introduction of aspartame-sweetened Diet Coke accelerated this trend. Today, at least in the United States, "diet" is nearly synonymous with the use of aspartame in beverages.
Neotame and advantame are further derivatives of aspartame. They received FDA approval in 1998 and 2014 respectively. Due to its high efficiency (20,000 times sucrose) which enables use of minute quantities for sweetening, advantame has the advantage of being safe to consume for individuals with phenylketonuria. As such, products sweetened with it are not required to carry a phenylalanine warning label. [15]
In 1970, the Food and Drug Administration banned cyclamates in the United States based on the results of a study which found that it caused bladder cancer in rats in combination with saccharin. This effect was later revealed to be specific to rodents; neither saccharin nor cyclamate are now considered human carcinogens. Nevertheless, cyclamate remains banned in the US. [1]
Recently, two other sweeteners have been used with increasing frequency: sucralose (marketed as Splenda) and acesulfame potassium ("Sunett" or "Ace K"). The K in "Ace K" represents the chemical symbol for potassium. Acesulfame potassium is usually combined with aspartame, sucralose, or saccharin rather than alone and its use is particularly common among smaller beverage producers (e.g. Big Red). Diet Rite is the non-aspartame diet soft drink brand with the highest sales today; it uses a combination of sucralose and acesulfame potassium.[ citation needed ]
In the US, sucralose and Ace-K received FDA approval for use in soft drinks in 1998. [15]
Advocates say drinks employing these sweeteners have a more natural sugar-like taste than those made just with aspartame, and do not have a strong aftertaste. The newer aspartame-free drinks can also be safely consumed by phenylketonurics, because they do not contain phenylalanine. Critics say the taste is not better, merely different, or note that the long-term health risks of all or certain artificial sweeteners is unclear.[ citation needed ]
The widespread, though not universal, agreement that the newest formulations taste much more "normal" (sugar-like) than the older diet soft drinks have prompted some producers, such as Jones Soda, to abandon the "diet" label entirely in favor of "sugar-free", implying that the taste is good enough to drink even when not trying to lose weight. (This idea was first floated by Diet Coke in 1984, with the tagline, "Just For the Taste of It.")[ citation needed ]
In 2005, The Coca-Cola Company announced it would produce a sucralose-containing formulation of Diet Coke known as Diet Coke with Splenda, but that it would continue to produce the aspartame version as well. There were also rumors that a sugar-free version of Coca-Cola Classic, also sweetened with sucralose, was being formulated as well. This formulation was eventually called Coca-Cola Zero, though it is sweetened with aspartame in conjunction with acesulfame potassium.[ citation needed ]
Stevia-based sweeteners incorporate steviol glycosides, sweet-tasting compounds produced in the leaves of the Stevia rebaudiana plant.
One study investigated the electrochemical properties of stevia rebaudiana, a herb with potential as a glucose sugar alternative. By using a cyclic voltammetric technique with a nano-sensor modified glassy carbon electrode, the limited safety dose was determined as 0.4 mM (28 mg/mL), where the stevia compound acted as an anti-oxidative sweetener. The study also showed that the electrochemical properties of stevia varied in acidic and alkaline pH, with an oxidative behavior in acidic and an anti-oxidative behavior in alkaline solutions. [16]
Initially launched in Argentina in 2013, Coca-Cola Life is made with a mix of stevia and sugar as its sweeteners. Pepsi has also released a variant of their cola sweetened with stevia and sugar, called Pepsi Next.
The table below displays milligrams of sweetener and phosphorus in a 12-ounce (≈355 ml) serving of canned soft drink, as provided by the manufacturers in the US market in 2012. Fountain drinks may contain different sweeteners or different amounts of the same sweeteners. [17] [18] [19]
| Beverage | Aspartame (mg) | Acesulfame K (mg) | Sucralose (mg) | Phosphorus (mg) | ||||
|---|---|---|---|---|---|---|---|---|
| Diet Coke | 188 | 0 | 0 | 27 | ||||
| Coke Zero Sugar | 87 | 47 | 0 | 54 | ||||
| Diet Pepsi | 124 | 32 | 0 | 33 | ||||
| Diet Pepsi Lime | 125 | 32 | 0 | 89 | ||||
| Diet Pepsi Vanilla | 125 | 32 | 0 | 89 | ||||
| Pepsi Zero Sugar | 125 | 32 | 0 | 42 | ||||
| Pepsi Next | 36 | 18 | 14 | 33 | ||||
| Diet Dr. Pepper | 185 | 0 | 0 | 50 | ||||
| Diet Mountain Dew | 86 | 27 | 27 | 0 | ||||
| Sprite Zero Sugar | 75 | 51 | 0 | 0 | ||||
| Fresca | 75 | 51 | 0 | 0 | ||||
| Barq's Diet Root Beer | 99 | 61 | 0 | 0 | ||||
Many consumers are concerned about possible health effects of sugar substitutes and caffeine overuse. [20] [21]
Some older reviews and dietetic professionals have concluded that moderate use of non-nutritive sweeteners as a safe replacement for sugars can help limit energy intake and assist with managing blood glucose and weight. [22] [23] [24] [25]
However, newer and industry-independent studies suggest an association with weight gain and increased diabetes risk. A meta-analysis published in Frontiers in Nutrition observed a significant association between artificially sweetened beverages (ASBs) and an increased risk of type 2 diabetes, with a pooled relative risk (RR) of 1.32 (95% CI: 1.11, 1.56) [26] . Another study that suggests increased diabetes risk with diet soft drinks was published in 2015 [27] which interestingly suggested a higher risk of diabetes with diet soft drinks compared to sugared soft drinks. While reverse causality could not be excluded, newer studies, for example MESA showed that regular consumption of diet soft drinks is associated with an increased risk of metabolic syndrome and type 2 diabetes, independent of adiposity measures [28] . These results are largely consistent with other research in the field, providing a robust body of evidence for the potential adverse health effects of diet soft drinks.
There are several possible explanations for the counter-intuitive weight gain and increased diabetes risk with the so called diet sodas. Artificial sweeteners may alter the brain's response to sweetness, potentially increasing cravings for high-calorie foods [29] . Some research suggests that artificial sweeteners might affect insulin response and metabolism, potentially leading to weight gain [30]
According to the World Health Organization, aspartame, a sweetener found in diet drinks and other food items, may be a potential cancer-causing agent. However, it is still considered safe to consume in moderation. [31]
In countries outside of the United States, United Kingdom and Canada, the term "light" is often used instead of "diet"; sometimes, even in countries that do not speak English, the word "light" in English is used (e.g., "Coca-Cola Light" in Spain). [32] The formulation of these is slightly different than the "diet"-named versions and thus the taste is slightly different.
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In an effort to profit on the surging popularity of low-carbohydrate diets, Coca-Cola and PepsiCo both released reduced-calorie versions of their flagship colas in 2004. The products contain approximately half the sugar of the regular versions. The Pepsi variant, Pepsi Edge, is sweetened with sucralose and corn syrup. The sweetening of the Coca-Cola variant, Coca-Cola C2, is a combination of corn syrup, aspartame, acesulfame potassium and sucralose. Pepsi discontinued Edge in 2005, citing lackluster sales. Coca-Cola soon followed suit. Pepsi then released Pepsi Max in 2012.
Half of the sugar of a can of regular cola still exceeds the daily sugar allowance of some popular low-carbohydrate diets. It is possible that these soft drinks were targeted to so-called "carb-conscious consumers", who are paying attention to their carbohydrate intake but not trying to drastically reduce it.
According to a study by the National Center for Health Statistics, about one-fifth of the US population ages 2 years and over consumed diet drinks on a given day in 2009‒2010, and 11% consumed 16 fluid oz. of diet drinks or more. Overall, the percentage consuming diet drinks was higher among females compared with males. The percentage consuming diet drinks was similar for females and males at all ages except among 12- to 19-year-olds, where a higher percentage of females than males consumed diet drinks. A higher percentage of non-Hispanic white people consumed diet drinks compared with non-Hispanic black and Hispanic people. The study included calorie-free and low-calorie versions of soft drinks, fruit drinks, energy drinks, sports drinks, and carbonated water. [33]
Diet soda is defined in US law as a food of minimal nutritional value. [34]
Aspartame is an artificial non-saccharide sweetener 200 times sweeter than sucrose and is commonly used as a sugar substitute in foods and beverages. It is a methyl ester of the aspartic acid/phenylalanine dipeptide with brand names NutraSweet, Equal, and Canderel. Aspartame was approved by the US Food and Drug Administration (FDA) in 1974, and then again in 1981, after approval was revoked in 1980.
Cola is a carbonated soft drink flavored with vanilla, cinnamon, citrus oils, and other flavorings. Cola became popular worldwide after the American pharmacist John Stith Pemberton invented Coca-Cola, a trademarked brand, in 1886, which was imitated by other manufacturers. Most colas originally contained caffeine from the kola nut, leading to the drink's name, though other sources of caffeine are generally used in modern formulations. The Pemberton cola drink also contained a coca plant extract. His non-alcoholic recipe was inspired by the coca wine of pharmacist Angelo Mariani, created in 1863.
Sucralose is an artificial sweetener and sugar substitute. As the majority of ingested sucralose is not metabolized by the body, it adds very little food energy. In the European Union, it is also known under the E number E955. It is produced by chlorination of sucrose, selectively replacing three of the hydroxy groups—in the C1 and C6 positions of the fructose portion and the C4 position of the glucose portion—to give a 1,6-dichloro-1,6-dideoxyfructose–4-chloro-4-deoxygalactose disaccharide. Sucralose is about 600 times sweeter than sucrose, 3 times as sweet as both aspartame and acesulfame potassium, and 2 times as sweet as sodium saccharin.
A sugar substitute is a food additive that provides a sweetness like that of sugar while containing significantly less food energy than sugar-based sweeteners, making it a zero-calorie or low-calorie sweetener. Artificial sweeteners may be derived through manufacturing of plant extracts or processed by chemical synthesis. Sugar substitute products are commercially available in various forms, such as small pills, powders, and packets.
Diet Coke is a sugar-free and low-calorie soft drink produced and distributed by the Coca-Cola Company. It contains artificial sweeteners instead of sugar. Unveiled on July 8, 1982, and introduced in the United States one month later, it was the first new brand since Coca-Cola's creation in 1886 to use the Coca-Cola trademark. The product quickly overtook the company's existing diet cola, Tab, in sales.
Acesulfame potassium, also known as acesulfame K or Ace K, is a synthetic calorie-free sugar substitute often marketed under the trade names Sunett and Sweet One. In the European Union, it is known under the E number E950. It was discovered accidentally in 1967 by German chemist Karl Clauss at Hoechst AG. Acesulfame potassium is the potassium salt of 6-methyl-1,2,3-oxathiazine-4(3H)-one 2,2-dioxide. It is a white crystalline powder with molecular formula C
4H
4KNO
4S and a molecular weight of 201.24 g/mol.
Pepsi One, corporately styled PEPSI ONE, was a sugar-free cola, marketed by PepsiCo in the United States as an alternative to regular Pepsi and Diet Pepsi.
Tab was a diet cola soft drink produced and distributed by The Coca-Cola Company, introduced in 1963 and discontinued in 2020. The company's first diet drink, Tab was popular among some people throughout the 1960s and 1970s as an alternative to Coca-Cola. Several variations were made, including a number of fruit-flavored, root beer, and ginger ale versions. Caffeine-free and clear variations were released in the late 1980s and early 1990s.
Diet Rite is an American brand of no-calorie soft drinks that was originally distributed by the RC Cola company.
Coca-Cola C2 was a cola-flavored beverage produced in response to the low-carbohydrate diet trend. This Coke product was marketed as having half the carbohydrates, sugars and calories compared to standard Coca-Cola. It contained aspartame, acesulfame potassium, and sucralose in addition to the high fructose corn syrup typically found in cola beverages distributed in America.
Fresca is a grapefruit-flavored citrus soft drink created by The Coca-Cola Company. Borrowing the word Fresca from Italian, Spanish, and Portuguese, it was introduced in the United States in 1966. Originally a bottled sugar-free diet soda, sugar sweetened versions were introduced in some markets.
Powerade is a sports drink created and sold by the Coca-Cola Company. Its primary competitor is Gatorade, which is owned by PepsiCo.
Diet Pepsi, currently stylised in all caps as PEPSI DIET, is a diet carbonated cola soft drink produced by PepsiCo, introduced in 1964 as a variant of Pepsi with no sugar. First test marketed in 1963 under the name Patio Diet Cola, it was re-branded as Diet Pepsi the following year, becoming the first diet cola to be distributed on a national scale in the United States. In the 1960s and 1970s, its competition consisted of the Coca-Cola Company's subsequently discontinued Tab. The United States represents the largest single market for Diet Pepsi.
Shasta Beverages is an American soft drink manufacturer that markets a value-priced soft drink line with a wide variety of soda flavors, as well as a few drink mixers, under the brand name Shasta. The company name is derived from Mount Shasta in northern California and the associated Shasta Springs.
Sierra Mist was a lemon-lime flavored soft drink line introduced by PepsiCo in 1999. By 2003 it was available in all US markets.
Equal is an American brand of artificial sweetener containing aspartame, acesulfame potassium, dextrose and maltodextrin. It is marketed as a tabletop sweetener by Merisant, a global corporation which also previously owned the well-known NutraSweet brand when it was a subsidiary of Monsanto and which has headquarters in Chicago, Illinois, Switzerland, Mexico, and Singapore. In French Canada, Equal is known as "Égal".
Fruit2O, formerly manufactured by Kraft, is a lightly flavored, non-carbonated water beverage introduced in 1999. Fruit2o was introduced to compete not only with the bottled water market but also with the soft drink market. Sunny Delight Beverages purchased the Veryfine Products line from Kraft in 2007.
Pepsi Zero Sugar, is a zero-calorie, sugar-free, formerly ginseng-infused cola sweetened with aspartame and acesulfame K, marketed by PepsiCo. It originally contained nearly twice the caffeine of Pepsi's other cola beverages. Before a recipe change in late 2022, Pepsi Zero Sugar contained 69 milligrams of caffeine per 355 mL (12.5 imp fl oz), versus 36 milligrams in Diet Pepsi. A new logo was introduced in 2020.
Sprite is a clear, lemon-lime flavored soft drink created by the Coca-Cola Company. Sprite comes in multiple flavors, including cranberry, cherry, grape, orange, tropical, ginger, and vanilla. Ice, peach, Berryclear remix, and newer versions of the drinks are artificially sweetened. Sprite was created to compete primarily against 7-Up.
Pepsi Next is a discontinued cola-flavored carbonated soft drink produced by PepsiCo. It was a variant of the Pepsi cola range.
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