Which of the following provides the most energy when metabolized?
a. protein
b. alcohol
c. fat
d. carbohydrates
Answer: c. fat
Fats provide the most energy when metabolized, at 9kcal/g. alcohol provides 7kcal/g, and carbohydrates and protein both provide about 4kcal/g. this is why fats are the primary energy source for aerobic types of exercise.