Proteins are broken down into amino acids. Fats are broken down into fatty acids, cholesterol, tryglycerides, and a few other things as well.
Carbohydrates provide our bodies with short bursts of quick energy .
Glucose also fuels all of our brain functions. Each and every cell in our body gets a little bit of glucose after we eat a carbohydrate. The glucose is then stored as glycogen. When we are in need of energy, the body will first burn glucose. It burns off very quickly, however, because there is so little of it in each cell.