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The calorie is a unit of energy that originated from the caloric theory of heat. [ 1][ 2] The large calorie, food calorie, dietary calorie, or kilogram calorie is defined as the amount of heat needed to raise the temperature of one liter of water by one degree Celsius (or one kelvin ). [ 1][ 3] The small calorie or gram calorie is defined as ...
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:
Atwater system. The Atwater system, [1] named after Wilbur Olin Atwater, or derivatives of this system are used for the calculation of the available energy of foods. The system was developed largely from the experimental studies of Atwater and his colleagues in the later part of the 19th century and the early years of the 20th at Wesleyan ...
Human nutrition deals with the provision of essential nutrients in food that are necessary to support human life and good health. [ 1] Poor nutrition is a chronic problem often linked to poverty, food security, or a poor understanding of nutritional requirements. [ 2]
A sample nutrition facts label, with instructions from the U.S. Food and Drug Administration [1] The nutrition facts label (also known as the nutrition information panel, and other slight variations) is a label required on most packaged food in many countries, showing what nutrients and other ingredients (to limit and get enough of) are in the food.
There are three principal classes of macronutrients: carbohydrate, protein and fat. [1] Macronutrients are defined as a class of chemical compounds which humans consume in relatively large quantities compared to vitamins and minerals which provide humans with energy. Fat has a food energy content of 38 kilojoules per gram (9 kilocalories per ...
If you want to gain weight, the Cleveland Clinic recommends increasing your calorie intake by 300 to 500 calories a day—3,122 to 3,322 calories per day for the average guy, assuming his activity ...
The tables below include tabular lists for selected basic foods, compiled from United States Dept. of Agriculture ( USDA) sources. 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 ...