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One calorie is defined as the quantity of heat necessary to raise the temperature of 1kg (1L) of water 1degree C. The heat of combustion measurement represents the amount of heat liberated by the complete oxidation of a given food. Average gross energy values are 4.2 kcal per gram for carbohydrate, 9.4 kcal per gram for lipid, and 5.65 kcal per gram for protein. The coefficient of digestibility is the proportion of the ingested food actually digested and absorbed by the body. Coefficients of digestibility average approximately 97% for carbohydrates, 95% for lipids, and 92% for proteins. Thus, the net energy values are 4 kcal per gram of carbohydrate, 9 kcal per gram of lipid, and 4 kcal per gram of protein. These values are used to estimate the net energy value of typical foods in a diet. Knowing the caloric values allows one to compute the caloric content of any meal - as long as the carbohydrate, lipid, and protein compositions are known. |
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Email: yourpersonaltrainer@ic24.net
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