Is the energy (kilocalories consumed that the body uses to perform only its most essential activities.

Food is the energy, measured in kilocalories that the body uses to perform only its most essential activities. This is also referred as nutritional energy. It is a chemical energy that organisms derive from food through the process of cellular respiration. Humans and animals need a minimum amount of calories in order to sustain their metabolism and move their muscles. The units of energy are the calories.