The primary function of the digestive system in humans is to break down food into nutrients that can be absorbed and utilized by the body. The process begins in the mouth, where food is mechanically and chemically processed, then continues through the esophagus to the stomach, where it is further digested with acids and enzymes. Nutrients are absorbed primarily in the small intestine, while waste products move into the large intestine for eventual elimination. This system is crucial for providing energy, supporting growth, and maintaining overall health, as it ensures the body receives the essential vitamins, minerals, and macronutrients needed for function.