What is the primary purpose of the digestive system?

The primary purpose of the digestive system is to break down food into smaller molecules that can be absorbed into the bloodstream and used by the body for energy, growth, and repair. The system begins with the mouth, where food is chewed and mixed with saliva, and continues through the esophagus, stomach, small intestine, and large intestine. Digestive enzymes and acids break down carbohydrates, proteins, and fats, while nutrients are absorbed in the small intestine. The remaining waste products are excreted as feces.