Dietary Energy – a Story of Calories
So, what is a calorie anyway? A calorie is a unit of energy.
1 calorie equals the energy needed to raise the temperature of 1 gram of water 1 degree Celsius. Dietary energy refers to the amount of energy released when we metabolize what we eat, and it is expressed in calories per gram (or kcal/g).
Carbohydrates and protein provide 4 kcal/g
Ethanol provides 7 kcal/g
Fat provides 9 kcal/g