Use the terms kinetic energy and chemical potential energy to describe the types of energy demonstrated as you eat an apple on your way to class

When you eat an apple, your body is transforming that apple and storing chemical potential energy from it. Now, when you move, your body has kinetic energy (like every moving object) and this energy can not "just appear", so this energy actually comes from the stored chemical potential energy in your body, that is being transformed into kinetic energy as you move.