digestion is when the body breaks down food for nutrients
total_parenteral_nutrition is feeding. digesting is involuntary_bodily_function. food is not nourishment. digestive_tract is not body_part. digestive_tract is body_part. food is nourishment. raw_foodism is food. digestive_system has do_with_food digestion is learning. digestive_absorption is involuntary_bodily_function.