Sports Nutrition Bible

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How is energy measured?

The short answer is.....in calories. I won't bore you with the science of it. Basically that's all you need to know. CALORIES is the answer

Energy Value of Different Food Components

1g provides...

Carbs 4 calories
fat 9 calories
protein 4 calories
alcohol 7 calories

So basically, 1 gram of carbohydrate contains 4 calories, as does 1 gram of protein. 1 gram of booze contains 7 calories while 1 gram of fat contains 9 calories. Easy.

So from that list, you can gather than fat is the most concentrated form of energy. However, that doesn't make it the 'best' form of energy for exercise.