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A serving size or portion size is the amount of a food or drink that is generally served. A distinction is made between a portion size as determined by an external agent, such as a food manufacturer, chef, or restaurant, and a "self selected portion size" in which an individual has control over the portion in a meal or snack. [ 1 ]
Included for each food is its weight in grams, its calories, and (also in grams,) the amount of protein, carbohydrates, dietary fiber, fat, and saturated fat. [1] As foods vary by brands and stores, the figures should only be considered estimates, with more exact figures often included on product labels.
A food pyramid is a representation of the optimal number of servings to be eaten each day from each of the basic food groups. [2] The first pyramid was published in Sweden in 1974. [ 3 ] [ 4 ] [ 5 ] The 1992 pyramid introduced by the United States Department of Agriculture (USDA) was called the "Food Guide Pyramid" or "Eating Right Pyramid".
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.
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Relative weight based on mass and height Medical diagnostic method Body mass index (BMI) Chart showing body mass index (BMI) for a range of heights and weights in both metric and imperial. Colours indicate BMI categories defined by the World Health Organization ; underweight, normal ...
A deficit can be created by decreasing calories consumed by lower food intake, such as by swapping high-calorie foods for lower calorie options or by reducing portion sizes. [1] A deficit can also be created by increasing output ( burning calories ) without a corresponding increase in input.
Calorie restriction (also known as caloric restriction or energy restriction) is a dietary regimen that reduces the energy intake from foods and beverages without incurring malnutrition. [1] [2] The possible effect of calorie restriction on body weight management, longevity, and aging-associated diseases has been an active area of research. [1]
To facilitate evaluation by consumers, food energy values (and other nutritional properties) in package labels or tables are often quoted for convenient amounts of the food, rather than per gram or kilogram; such as in "calories per serving" or "kcal per 100 g", or "kJ per package". The units vary depending on country: