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Originally Posted by aka123
No, it was pretty much correct. The only real difference comes from processing your food (the amount of energy it takes). Just energy wise it really doesn't matter that do you eat just sugar or some healthy stuff. Though it takes more energy to process raw carrots than sugar, but otherwise, assuming your body can use what you eat.
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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.