Weight management

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Nutrition is an important part of maintaining a healthy body weight. Apples.jpg
Nutrition is an important part of maintaining a healthy body weight.

Weight management refers to behaviors, techniques, and physiological processes that contribute to a person's ability to attain and maintain a healthy weight. [1] [2] Most weight management techniques encompass long-term lifestyle strategies that promote healthy eating and daily physical activity. [3] Moreover, weight management involves developing meaningful ways to track weight over time and to identify the ideal body weights for different individuals. [4]

Contents

Weight management strategies most often focus on achieving healthy weights through slow but steady weight loss, followed by maintenance of an ideal body weight. [5] However, weight neutral approaches to health have also been shown to result in positive health outcomes. [6] [7]

Understanding the basic science of weight management and strategies for attaining and maintaining a healthy weight is very important because obesity is a risk factor for development of many chronic diseases, like Type 2 diabetes, hypertension and cardiovascular disease. [1] [5] [8]

Key factors

There are many factors that contribute to a person's weight, including: diet, physical activity, genetics, environmental factors, health care support, medications, and illnesses. [5] [9] [10] [11] Each of these factors affect weight in different ways and to varying degrees, but health professionals most often stress the importance of diet and physical activity because they can be affected by conscious behavior modification. [9] [12] Attaining a healthy weight involves recognition of general techniques such as portion sizing, self-monitoring, and daily diet consistency. [13] Once this healthy weight has been attained, maintaining this stable weight additionally involves physical activity and control of an individual's environment and eating patterns. [14] Furthermore, healthcare support in the form of primary care medical supervision and following up over time has been shown to be helpful for long-term weight management. [15]

The following is a review of some of the key components of weight management in humans.

Energy balance

The science behind weight management is complex, but one of the key concepts that governs weight management is Energy Balance . [9] Energy Balance is the phrase used to describe the difference between the number of calories a person consumes and the number of calories that same person expends (a.k.a. burns) in a given time period. [9] There are three possible scenarios when it comes to the energy balance equation:

The calories a person consumes come from food and drink intake. [9] The calories a person expends comes from their basal metabolic rate and their daily physical activity. [5] The human body is very good at maintaining a neutral energy balance, particularly with a diet composed of fruits, vegetables, and meats so that calories consumed do not substantially exceed calories expended in a given time period and vice versa. [5] This energy balance is regulated by hormones like Leptin (suppresses), Ghrelin (stimulates), and Cholecystokinin (suppresses) which either suppress or stimulate appetite. [5]

An image that shows nutrition label information including calorie amounts Energy drink and fast food cheeseburger calorie comparison.jpg
An image that shows nutrition label information including calorie amounts

Diet

The quantity of food and drink consumed by an individual may play a role in weight management, as may the types of food and drink a person consumes. [5] [9] [12] For example, intake of sweetened drinks such as sodas or juices can lead to increased energy intake that is not neutralized by a decrease in accompanying food intake. [5] Increased portion sizes may also lead to increased energy intake. [5]

Physical activity

Running on a treadmill is one form of physical activity that can be done at home or at a gym. Exercise Treadmill Convey Motion.jpg
Running on a treadmill is one form of physical activity that can be done at home or at a gym.

Physical activity can be related to a person's professional activities, non-work related daily activities like walking or cycling, or it can be in the form of activities such as recreation or team sports. [5] The specific type of activity can be tailored to populations such as children, pregnant women, and elderly adults. [5] Tailored activity to one's fitness level also encourages the body to heal properly and prevent any injuries as a result of exercise. [16]

Physical inactivity leads to less energy expenditure and is a factor that impacts obesity rates in both children and adults. [17] Physical inactivity has become a worldwide concern since inactivity also elevates the risk of heart disease. [16] Regular physical activity can reduce the risk for noncommunicable diseases like diabetes, heart disease, and dyslipidemia (high cholesterol). [5]

Basal metabolic rate

Basal metabolic rate (BMR) is one of the main components of a person's daily energy expenditure. It is defined as the amount of energy that is expended during a given amount of time by a person at rest. This energy at rest is used to pump blood throughout the body, maintain proper brain function, break down toxins, and ensure other bodily functions. Technically speaking, BMR is the energy the body expends during the following specific conditions: immediately after waking up, while in a resting state, and after fasting for 12–14 hours. Sometimes the term Resting Metabolic (RMR) is used in place of BMR, but RMR is not solely measured under the previously listed stringent conditions and it is about 10% more than BMR. [18]

The BMR is directly proportional to a person's lean body mass. [5] [18] In other words, the more lean body mass a person has, the higher their BMR. BMR is also affected by acute illnesses and increases with burns, fractures, infections, fevers, etc. It can be measured via direct and indirect calorimetry. However, it is also possible to approximately estimate BMR using several equations that factor in a person's age, sex, height, and weight. [18] Some of the most popular and accurate equations used to calculate BMR are the original Harris-Benedict equations, the revised Harris-Benedict equations, and the Mifflin St. Jeor equation. [19]

The original Harris-Benedict Equations are as follows:

The revised Harris-Benedict Equations are as follows:

The Mifflin St. Jeor Equation is as follows:

The Mifflin St. Jeor Equation has been found to be the most accurate predictor of BMR compared to BMR measured by direct and indirect calorimetry. [19]

Body mass index

Body mass index (BMI) is a value used to get a general sense of a person's overall mass and is calculated using a person's height and weight. It is more often used than weight alone to determine if an individual is underweight, normal weight, overweight, or obese. The following two equations can used to calculate BMI depending on the units used for height (meters vs. inches) and weight (kilograms vs. pounds): [5]

or

Though BMI is often used to help assess for excess weight, it is not a perfect representation of a person's body fat percentage. For example, an individual can have a higher than normal BMI but a normal body fat percentage if they have higher than average muscle mass. This is because excess muscle contributes to a higher weight. Since BMI is not a perfect representation of a person's body fat percentage, other measurements like waist circumference are often used to better assess for unhealthy excess weight.

The following table shows how different ranges of BMIs are often categorized into underweight, normal weight, overweight, and obese: [5]

Waist circumference may be used as an alternative method to assess weight. Obesity-waist circumference.svg
Waist circumference may be used as an alternative method to assess weight.
Classification of Overweight and Obesity by Body Mass Index (BMI)
Category [20] BMI
Underweight< 18.5
Normal Weight18.5 – 24.9
Overweight25.0 – 29.9
Obesity (Class I)30.0 – 34.9
Obesity (Class II)35.0 – 39.9
Obesity (Class III)≥ 40.0

On average, groups of people with "obese" BMIs may have a higher risk of developing illnesses like diabetes, hypertension, dyslipidemia (high cholesterol), liver disease, and some cancers. "Underweight" BMIs may indicate malnutrition or other health problems. However, BMI has limitations when used to describe individual health rather than describing populations of people. [5]

Complicating factors

Thermogenic effect of food

The thermogenic effect of food is another component of a person's daily energy expenditure and refers to the amount of energy it takes the body to digest, absorb, and metabolize nutrients in the diet. [5] The amount of energy expended while processing food differs by individual but on average it amounts to about 10% the number of calories consumed during a given time period. [5] [18] Processing proteins and carbohydrates has more of a thermogenic effect than does processing fats. [5]

Medications

Certain medications can cause either weight loss or weight gain. [5] Such side effects are often listed for each medication and should be considered when attempting to manage a person's weight. [5] Semaglutide is an anti-obesity drug that is also used for blood sugar control. [21]

Diseases

Medical conditions associated with weight gain include hypothyroidism, [22] Cushing's syndrome, Polycystic Ovary Syndrome (PCOS), and congestive heart failure. [5] [23] Medical conditions such as cancer, gastrointestinal illness, psychiatric disorders, infections, endocrine disorders, and neurologic disorders may lead to weight loss. [5]

Commonly associated with weight gain

Polycystic ovary syndrome (PCOS), which is characterized by insulin resistance and hyperandrogenism, is a common condition that has been linked to obesity. [24] A combination of genetics, lifestyle, and environment appear to contribute to the hormonal changes responsible for weight gain and obesity seen in individuals with PCOS. [24] There appears to be a bidirectional relationship between obesity and PCOS, whereby PCOS increases the risk of obesity and similarly, obesity has been found to exacerbate PCOS hormonal differences and clinical symptoms. [24] [25] Obesity has been linked with pancreatic β-cell dysfunction and insulin resistance. [26] In diabetes, impaired β-islet cells are responsible for the lack of blood glucose control. [26] Individuals with a higher body mass index concerning for obesity may have increased levels of hormones, proinflammatory markers, and glycerol, which can contribute to insulin resistance. [26] The combined effects of impaired pancreatic β-islet cells and insulin resistance increase the likelihood of developing diabetes. [26]

In individuals with blood sugar levels in the prediabetic range, weight loss was demonstrated to have many benefits including improved glycemic control and a reduced risk of developing type 2 diabetes. [27]

Commonly associated with weight loss

Common gastrointestinal disorders associated with weight loss are malabsorption due to Celiac disease or chronic pancreatitis. [5] Depression and eating disorders such as anorexia nervosa can also contribute to weight loss. [5] Infectious causes of weight loss include HIV/AIDS. [5]

While Type 1 diabetes has been found to cause weight loss, type 2 diabetes has been associated with weight gain. [5] Other endocrine causes of weight loss include hyperthyroidism and chronic adrenal insufficiency. [5]

Intentional weight loss

Diets

As weight loss depends partly on calorie intake, different kinds of calorie-reduced diets, such as those emphasizing particular macronutrients (low-fat, low-carbohydrate, etc.), have been shown to be equally effective as weight loss tools. [28] [29] [30] [31] [32] [33] [34] Nonetheless, a low-saturated fat diet complemented with high fiber can be helpful for those who are found to be obese based on BMI. [12] Furthermore, a low-carbohydrate diet can have the added benefits of blood sugar control in those with Type 2 Diabetes Mellitus. [12] A low-carbohydrate diet can also improve weight loss, HDL, and cholesterol in certain individuals. [35] Compared to a typical diet, low-carbohydrate, low-fat, and moderate macronutrient diets can all positively impact weight loss. [34] However, weight regain is common, and the outcome of a diet can vary widely depending on the individual. [12] [29] [32] [36] Rather than focusing on the nuances of each diet type, molding one diet in a way that the person can continuously adhere in the long-term could be beneficial for weight loss. [5]

DASH diet

The Dietary Approaches to Stop Hypertension (DASH) diet focuses on increasing the consumption of fruits, vegetables, whole grains and low-fat dairy products. [12] [37] [38] DASH offers an intervention to manage elevated blood pressures and prevent cardiovascular disease non-pharmacologically. [38] [39] [40] [41] In addition, combining the DASH diet with a reduced sodium intake will further decrease blood pressure, but is not required for therapeutic effect. [37] This is because it has been proven to be effective at a wide range of sodium intake levels. [37] More recent reviews of DASH have continued to advocate its efficacy as an affordable weight loss tool, but stress that diet adherence is key to produce the desired results. [42]

Fruits and vegetables are considered staples of the Mediterranean diet. DIETA MEDITERRANEA ITALIA.JPG
Fruits and vegetables are considered staples of the Mediterranean diet.
Mediterranean diet

The Mediterranean diet involves eating fruits, vegetables, whole grains and beans while replacing butter with extra-virgin olive oil and limiting red meats, dairy, sweets, and processed foods. [43] It has been shown to be effective for long term weight loss with added cardiovascular health benefits. [12] [44] For example, the Mediterranean diet can lead to decreased triglyceride and lipid levels as well as improved blood pressure readings. [33] It can also improve blood sugar levels in those diagnosed with Type 2 Diabetes Mellitus. [33]

Ketogenic diet

The ketogenic or "keto" diet involves intake of less than 50 g of carbohydrates daily along with increased fat and protein amounts. [45] One type of ketogenic or low carbohydrate diet is the "Atkins" Diet, which does not restrict protein and fat amounts. [12] However, there are other ketogenic diets that place restrictions on the total amount of daily proteins and fats. [12]

Plant-based diet

The plant-based diet is largely based on consumption of beans, grains, fruits, and vegetables and removal of meat, fish, and occasionally dairy and egg products from intake. [46] In other words, fiber and unsaturated fat intake is increased and consumption of higher calorie meats and saturated fats is decreased. [46] This diet has been shown to reduce BMI and introduce positive body composition changes when compared to a carnivore diet. [47]

Intermittent fasting

Intermittent fasting (IF) involves consistent fasting blocks of time where fewer or no calories are consumed. [12] Intermittent fasting has been shown to improve fasting blood glucose levels and insulin resistance with a concurrent reduction in BMI. [48]

Strategies

A dinner example of portion sizes relative to food groups Dinner meal - MyPlate 20210810-FNS-UNC-0017.jpg
A dinner example of portion sizes relative to food groups

Modifying plate size

Some studies have suggested that using smaller plates might help people to consume smaller portion sizes. [49]

Modifying portion sizes may impact energy intake. [50] Those who are presented with larger portion sizes do not report to have high levels of satiety. [50] In other words, hunger and satiety signals could be ignored with large portion sizes. [50] In a study focused on portion sizes, participants consumed 31% less calories with the small portion sized of a 6-inch submarine sandwich compared with the large portion size of a 12-inch submarine sandwich. [50] Increased portions have occurred simultaneously with the increase in obesity rates. Large portion sizes could be one of the factors contributing to the current increase in average body weight in the US. [50] Evidence from a systematic review of 72 randomized controlled trials indicates that people consistently eat more food when offered larger portion, package, or tableware sizes as opposed to smaller size alternatives. [51]

Choosing low-calorie foods

The majority of guidelines agree that a calorie deficit, particularly 500-750 kcal daily, can be recommended to those who want to lose weight. [5] [12] A moderate decrease in caloric intake will lead to a slow weight loss, which is often more beneficial than a rapid weight loss for long term weight management. [8] For example, low fat meats reduce the total amount of calories and cholesterol consumed. [52]

Increasing protein intake

A high protein diet relative to a low-fat or high-carbohydrate diet may increase thermogenesis and decrease appetite leading to weight reduction, [53] particularly 3-6 months into a diet when rapid weight loss is observed. [54] However, these advantages may be reduced later at 12–24 months into a diet during the slow weight loss phase. [54]

Eating more soup

Studies have demonstrated that when compared to solid foods, soup ingestion decreases the amount of energy intake and increases feelings of satiety. [55] When soup is consumed before a meal, there is a 20% decrease in the number of calories consumed during said meal. [56]

Eating more dairy

Milk intake has been advocated as a weight loss strategy due to its calcium and other nutrients. Glass of milk on tablecloth.jpg
Milk intake has been advocated as a weight loss strategy due to its calcium and other nutrients.

Studies have shown that a diet high in dairy decreases total body fat. [57] This occurs because a high amount of dietary calcium increases the amount of energy and fat excreted from the body. [58] Other studies have noted that dairy sources of calcium lead to greater weight loss than supplemental calcium intake. [59] This could be due to the bioactive components of dairy sources, especially when combined with a lower calorie diet. [60] Since most natural dairy products contain fat content, there is a common understanding that this may cause weight gain. [59] However, dairy contains ingredients such as whey protein and certain combinations of protein/calcium nutrients that induce a positive effect on satiety, increase energy loss, and assists weight loss. [61]

Eating more vegetables

Fruits and vegetables have been shown to increase satiety and decrease hunger signals. [62] These food groups have a low energy density, mainly due to the high water content and partly due to the fiber content. [62] The reduction of energy density has been shown to enhance satiety. [62] The water content adds satisfying weight without excess calories and fiber slows gastric emptying. [62] Studies have also shown that fiber decreases hunger and also decreases total energy intake. [62]

Increasing fiber intake

Fruits and vegetables are two sources of fiber as discussed above. Dietary fiber has been suggested to aid weight management by inducing satiety, [5] decreasing absorption of macronutrients and promoting secretion of gut hormones. [63] Dietary fiber consists of non-digestible carbohydrates and lignin, which are a structural component in plants. [64]

Fruits and vegetables contain fiber which has been shown to improve satiety and help with weight loss. Foods.jpg
Fruits and vegetables contain fiber which has been shown to improve satiety and help with weight loss.

Due to the high volume or water content of fiber-rich foods, fiber displaces available calories and nutrients from the diet. [65] Consumption of viscous fibers delays gastric emptying, which may cause an extended feeling of fullness. [66] Satiety is also induced by increasing chewing, which limits food intake by promoting the secretion of saliva and gastric juice, resulting in an expansion of the stomach. [67] In addition, hormone secretion is affected during fiber ingestion. [68] Insulin response is reduced and cholecystokinin (CCK) in the small intestine is increased. [63] Insulin regulates blood glucose levels while CCK adjusts gastric emptying, pancreatic secretion, and gall bladder contraction. [63] There is a direct correlation between CCK and satiety after foods of different fiber contents are consumed. [69]

In general, large intakes of dietary fiber at breakfast have been associated with less food intake at lunchtime. [70] Fiber may have the added benefit of helping consumers reduce food intake throughout the day, but results of studies examining this possibility have been conflicting. [69]

Increasing resistant starch intake

Resistant starch is a type of non-digestible, fermentable fiber resistant to amylase digestion in the small intestine. [71] It is broken down to short-chain fatty acids by microflora in the large intestine. [71] It is commonly found in cooked and cooled potatoes, green bananas, beans and legumes. [71] The short chain fatty acids can lead to further oxidation of fat and a higher energy expenditure. [72] Resistant starch dilutes energy density of food intake, maintains a bulking effect similar to non-fermentable fiber, and increases the expression of gut hormones PYY and GLP-1. [71] [73] [74] [75] The increase in gut hormone expression affects neuronal pathways in the brain that contribute to long-term energy balance [76] [77] and improved overall health of the intestines. [78]

Increasing caffeine intake

Caffeine and black coffee have been associated with increased energy expenditure and subsequent weight loss. [79] Caffeine belongs to a class of compounds called methylxanthines and is present in coffee, tea, cocoa, chocolate and some cola drinks. [80] Caffeine induces a thermogenic effect in the body by increasing sympathetic nervous system activity, which is an important regulator of energy expenditure. [81] [82] [83]

Increasing green tea intake

Green tea contains catechins that may aid weight loss. Health benefits of green tea.png
Green tea contains catechins that may aid weight loss.

Catechins are polyphenols that are a major component of green tea extract. [84] Green tea has been associated with decreasing blood glucose, [85] inhibiting hepatic and body fat accumulation, [85] [86] and stimulating thermogenesis [87] due to the catechins present in formulations. Moreover, catechins in the brain play a major role in satiety. [88] Independent of the caffeine content, green tea has also been shown to increase energy expenditure and fat oxidation in humans. [87] [89]

While green tea intake alone may not significantly reduce weight or BMI, combining intake with other strategies aimed at weight loss could be helpful for both loss and weight maintenance. [90]

See also

Related Research Articles

<span class="mw-page-title-main">Carbohydrate</span> Organic compound that consists only of carbon, hydrogen, and oxygen

A carbohydrate is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 and thus with the empirical formula Cm(H2O)n, which does not mean the H has covalent bonds with O. However, not all carbohydrates conform to this precise stoichiometric definition, nor are all chemicals that do conform to this definition automatically classified as carbohydrates.

Dieting is the practice of eating food in a regulated way to decrease, maintain, or increase body weight, or to prevent and treat diseases such as diabetes and obesity. As weight loss depends on calorie intake, different kinds of calorie-reduced diets, such as those emphasising particular macronutrients, have been shown to be no more effective than one another. As weight regain is common, diet success is best predicted by long-term adherence. Regardless, the outcome of a diet can vary widely depending on the individual.

<span class="mw-page-title-main">Abdominal obesity</span> Excess fat around the stomach and abdomen

Abdominal obesity, also known as central obesity and truncal obesity, is the human condition of an excessive concentration of visceral fat around the stomach and abdomen to such an extent that it is likely to harm its bearer's health. Abdominal obesity has been strongly linked to cardiovascular disease, Alzheimer's disease, and other metabolic and vascular diseases.

<span class="mw-page-title-main">Obesity</span> Medical condition in which excess body fat harms health

Obesity is a medical condition, sometimes considered a disease, in which excess body fat has accumulated to such an extent that it can potentially have negative effects on health. People are classified as obese when their body mass index (BMI)—a person's weight divided by the square of the person's height—is over 30 kg/m2; the range 25–30 kg/m2 is defined as overweight. Some East Asian countries use lower values to calculate obesity. Obesity is a major cause of disability and is correlated with various diseases and conditions, particularly cardiovascular diseases, type 2 diabetes, obstructive sleep apnea, certain types of cancer, and osteoarthritis.

<span class="mw-page-title-main">Weight loss</span> Reduction of the total body mass

Weight loss, in the context of medicine, health, or physical fitness, refers to a reduction of the total body mass, by a mean loss of fluid, body fat, or lean mass. Weight loss can either occur unintentionally because of malnourishment or an underlying disease, or from a conscious effort to improve an actual or perceived overweight or obese state. "Unexplained" weight loss that is not caused by reduction in calorific intake or increase in exercise is called cachexia and may be a symptom of a serious medical condition.

<span class="mw-page-title-main">Low-carbohydrate diet</span> Diets restricting carbohydrate consumption

Low-carbohydrate diets restrict carbohydrate consumption relative to the average diet. Foods high in carbohydrates are limited, and replaced with foods containing a higher percentage of fat and protein, as well as low carbohydrate foods.

Basal metabolic rate (BMR) is the rate of energy expenditure per unit time by endothermic animals at rest. It is reported in energy units per unit time ranging from watt (joule/second) to ml O2/min or joule per hour per kg body mass J/(h·kg). Proper measurement requires a strict set of criteria to be met. These criteria include being in a physically and psychologically undisturbed state and being in a thermally neutral environment while in the post-absorptive state (i.e., not actively digesting food). In bradymetabolic animals, such as fish and reptiles, the equivalent term standard metabolic rate (SMR) applies. It follows the same criteria as BMR, but requires the documentation of the temperature at which the metabolic rate was measured. This makes BMR a variant of standard metabolic rate measurement that excludes the temperature data, a practice that has led to problems in defining "standard" rates of metabolism for many mammals.

<span class="mw-page-title-main">Weight gain</span> Increase in a persons total body mass

Weight gain is an increase in body weight. This can involve an increase in muscle mass, fat deposits, excess fluids such as water or other factors. Weight gain can be a symptom of a serious medical condition.

Calorie restriction is a dietary regimen that reduces the energy intake from foods and beverages without incurring malnutrition. The possible effect of calorie restriction on body weight management, longevity, and aging-associated diseases has been an active area of research.

<span class="mw-page-title-main">High-protein diet</span> A diet high in protein

A high-protein diet is a diet in which 20% or more of the total daily calories come from protein. Many high protein diets are high in saturated fat and restrict intake of carbohydrates.

<span class="mw-page-title-main">Healthy diet</span> Type of diet

A healthy diet is a diet that maintains or improves overall health. A healthy diet provides the body with essential nutrition: fluid, macronutrients such as protein, micronutrients such as vitamins, and adequate fibre and food energy.

Specific dynamic action (SDA), also known as thermic effect of food (TEF) or dietary induced thermogenesis (DIT), is the amount of energy expenditure above the basal metabolic rate due to the cost of processing food for use and storage. Heat production by brown adipose tissue which is activated after consumption of a meal is an additional component of dietary induced thermogenesis. The thermic effect of food is one of the components of metabolism along with resting metabolic rate and the exercise component. A commonly used estimate of the thermic effect of food is about 10% of one's caloric intake, though the effect varies substantially for different food components. For example, dietary fat is very easy to process and has very little thermic effect, while protein is hard to process and has a much larger thermic effect.

<span class="mw-page-title-main">Very-low-calorie diet</span> Diet with very or extremely low daily food energy consumption

A very-low-calorie diet (VLCD), also known as semistarvation diet and crash diet, is a type of diet with very or extremely low daily food energy consumption. VLCDs are defined as a diet of 800 kilocalories (3,300 kJ) per day or less. Modern medically supervised VLCDs use total meal replacements, with regulated formulations in Europe and Canada which contain the recommended daily requirements for vitamins, minerals, trace elements, fatty acids, protein and electrolyte balance. Carbohydrates may be entirely absent, or substituted for a portion of the protein; this choice has important metabolic effects. Medically supervised VLCDs have specific therapeutic applications for rapid weight loss, such as in morbid obesity or before a bariatric surgery, using formulated, nutritionally complete liquid meals containing 800 kilocalories or less per day for a maximum of 12 weeks.

A diabetic diet is a diet that is used by people with diabetes mellitus or high blood sugar to minimize symptoms and dangerous complications of long-term elevations in blood sugar.

<span class="mw-page-title-main">Low-fat diet</span> Diet that contains limited amounts of fat

A low-fat diet is one that restricts fat, and often saturated fat and cholesterol as well. Low-fat diets are intended to reduce the occurrence of conditions such as heart disease and obesity. For weight loss, they perform similarly to a low-carbohydrate diet, since macronutrient composition does not determine weight loss success. Fat provides nine calories per gram while carbohydrates and protein each provide four calories per gram. The Institute of Medicine recommends limiting fat intake to 35% of total calories to control saturated fat intake.

<span class="mw-page-title-main">Western pattern diet</span> Modern dietary pattern

The Western pattern diet is a modern dietary pattern that is generally characterized by high intakes of pre-packaged foods, refined grains, red meat, processed meat, high-sugar drinks, candy and sweets, fried foods, industrially produced animal products, butter and other high-fat dairy products, eggs, potatoes, corn, and low intakes of fruits, vegetables, whole grains, pasture-raised animal products, fish, nuts, and seeds.

Intermittent fasting is any of various meal timing schedules that cycle between voluntary fasting and non-fasting over a given period. Methods of intermittent fasting include alternate-day fasting, periodic fasting, such as the 5:2 diet, and daily time-restricted eating.

<span class="mw-page-title-main">Diet and obesity</span> Effect of diet on obesity


Diet plays an important role in the genesis of obesity. Personal choices, food advertising, social customs and cultural influences, as well as food availability and pricing all play a role in determining what and how much an individual eats.

Hedonic hunger or hedonic hyperphagia is the "drive to eat to obtain pleasure in the absence of an energy deficit". Particular foods may have a high "hedonic rating" or individuals may have increased susceptibility to environmental food cues. Weight loss programs may aim to control or to compensate for hedonic hunger. Therapeutic interventions may influence hedonic eating behavior.

The Summermatter cycle is a physiological concept describing the complex relationship between physical activity/inactivity and energy expenditure/conservation.

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