We need food to live and stay healthy. Food provides us with energy and nutrients that are essential for growth. Our digestive system breaks down food into substances that our bodies can use. Food enters the mouth and is broken down by teeth and saliva before moving to the stomach and small intestine where it is further broken down by enzymes. Nutrients are then absorbed into the bloodstream while waste is eliminated through the large intestine and anus. A balanced diet from all major food groups is needed to provide the body with what it requires depending on factors like age and activity level.