What are the main processes of metabolism?

Metabolism is a combination of biochemical processes that your body uses to convert food into energy. These metabolic processes include breathing, eating and digesting food, delivering nutrients to your cells through your bloodstream, using energy by your muscles, nerves and cells, and finally eliminating waste from your body. The rate at which we burn calories or energy is called metabolic rate. Base metabolic rate is the most significant component of your overall metabolic rate.