Which of the following is a source of chemical energy and heat?
A
Fats
B
Protein
C
Minerals
D
Vitamins
Correct Option:
A
Explanation
Fats are highly concentrated sources of chemical energy, yielding about 9 kcal per gram, compared with roughly 4 kcal/g from carbohydrates or proteins. Oxidation of nutrients ultimately releases energy, some of which appears as heat. Vitamins and minerals themselves provide essentially no caloric energy.
