All living things need energy. The energy the body needs comes from the food it eats. The parts of the body that help break down the food it eats and turn it into nutrients for the body is called the digestive system. The digestive system is responsible for digesting food to release all of the nutrients in the body. Digesting food begins at the time food is put into the mouth. Digesting takes two forms, mechanical and chemical. Your mouth does the chewing which is referred to as mechanical digestion and your saliva and int...