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Human Body Four Energy Sources. The human body can only metabolize four types of energy sources. These four categories are carbohydrates (sugars and starches), fats (includes oils), proteins (animal and vegetable), and alcohol.These are the only four categories of substance a body can make energy out of. Alcohol.uman Body Four Energy Sources. The human body can only metabolize four types of energy sources. These four categories are carbohydrates (sugars and starches), fats (includes oils), proteins (animal and vegetable), and alcohol.
Fats also serve as solvents for hormones and fat-soluble vitamins. 3. Carbohydrates â form the major part of stored food in the body for later use of energy. Glucose which is a monosaccharide is the bodyâs primary source of energy. When in excess, it is stored in the liver as Glycogen. Carbohydrates are also important for fat oxidation and can also be converted into protein.