basic carbohydrate metabolism chemical burn
Overview. The three main fuel sources in humans are carbohydrates, fats, and proteins. They are used preferentially under different conditions. In general, the body burns carbohydrates, then fats, and then proteins, in that order. It is important to realize that energy metabolism is not an all-or-none phenomenon.verview. The three main fuel sources in humans are carbohydrates, fats, and proteins. They are used preferentially under different conditions. In general, the body burns carbohydrates, then fats, and then proteins, in that order. It is important to realize that energy metabolism is not an all-or-none phenomenon.