the whey and soy proteins that are eaten by most people as some kind of BEEFCAKE powder are broken down into simple sugars nearly as easily as simple sugars alone. hence, because the body doesn't really need all that much serum protein at any one time, that's generally what it does with them. liver function bloodwork will tell you if you have a serious protein deficiency, but if you don't, augmenting your diet with huge amounts of protein isn't all that great. if you need to raise your blood sugar quickly, for example, in the middle of a marathon, when your reserves are exhausted and you're literally running on what you can metabolize, go with the simple glucose gels. they are much more effective.
fat is one of the hardest things for your body to deal with, processing it requires a fair amount of exertion from your pancreas to excrete the enzyme that digests it. it's still a positive energy metabolic rx (unlike, say, celery or something else that's all water and insoluble fibers), but it's a lot more stress on your body, and isn't directly used very often. most often it's broken down slowly, then reformed into fat when your body finds out that you're a 21st century digital boy and just sit in front of the computer all day.
