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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.
Carbohydrate Stores: Muscle Glycogen, Liver Glycogen, and Glucose. The energy required to power the human body begins with the consumption of food, and the subsequent extraction by the body of the carbohydrate-based sugars, known as glucose and glycogen.