Originally Posted by brandonstills

That's not the whole equation though. If you only eat sugar you are going to spike your insulin. Which is a storage hormone, which means that excess energy goes straight to fat. You then have low blood sugar and get hungry again real soon. You also have low energy so you are less likely to exercise.

Contrast that to the same amount of calories with high fat and moderate protein. It is going to stay in your blood stream much longer, you are going to stay satiated longer so you aren't as tempted to eat more, and you have energy so you are more likely to exercise. Also, it isn't going to spike insulin so it's not going to fat.