Cellular respiration is the process when chemical energy from foods is rendered into energy form of Adenosine Triphosphate (ATP). This process is affected by the nutrients we eat so when you diet you change the nutrients which will have an effect on cellular respiration. The nutrients or types of food that go through the process of cellular respiration are fats, carbohydrates (glucose), proteins, and other acids. Cellular respiration is needed to get energy. Cellular respiration has three processes: glycolysis, Krebs cycle, and the electron transport chain. Without cellular respiration all living organism would seize to exist. We use ATP without even thinking about. A muscle twitch in your eyelid is being done by ATP. We could not breathe with ATP.