Final answer:
When the body cannot use the food, it is eliminated as waste through the digestive system.
Step-by-step explanation:
When the body cannot use the food, it is pushed out as waste. This process is called excretion. The waste materials are eliminated from the body through the digestive system, specifically through the large intestine and rectum. These waste materials include undigested food, fiber, and other indigestible substances.
Learn more about Food waste and elimination