Calorie
Calorie
Calorie, by definition, is the amount of heat required to raise the temperature of one kilogram of water one degree Celsius. The Calorie is the standard unit for measuring food energy; it is a unit measure for heat and is not a nutrient. The Calorie used in nutrition is the kilocalorie (kcal) or large calorie (Cal).
This program uses Calorie and calorie both to mean kilocalorie.
The caloric value of different food elements are: one gram of protein equals four calories, one gram of fat equals nine calories, and one gram of carbohydrate equals four calories. Nearly 80% of all food intake is used solely to maintain a body temperature of 98.6 degrees Fahrenheit.
References
Wilson, Eva D., et al. Principles Of Nutrition. 4th edition. New York: John Wiley & Sons, 1979.
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