– if carbohydrates are the body’s energy source, what exactly are calories?

Question

I keep hearing that carbs are the body’s fuel, but fats contain more calories per gram. Surely that means fat is the body’s primary source of fuel?

In: 3

Answer 1

That’s like saying “if my car runs on gas, then what exactly is a gallon?”

A unit of measure. But unlike gallon, we’re not measuring fuel quantity but the amount of energy released by that fuel.