Your body is in constant need of a consistent energy source. Carbohydrates provide this steady flow of energy.Â They are the macronutrients that are converted immediately into glucose that is immediately delivered to the different areas of your body. Proteins and fats could also be used for energy but it would compromise their main functions. But as they say, anything in excess is bad. Carbohydrates, if taken excessively, cause irregularities in your blood sugar. This would then make you too tired one time and irritated on the next. You really have to balance out your diet so you could have equal amounts of fat, fiber, and protein.