The document discusses the process of feeding and digestion in humans. It describes the digestive tract which includes the mouth, pharynx, esophagus, stomach, small intestine and large intestine. It explains that nutrients are the useful substances extracted from food during digestion and then distributed around the body, with waste excreted. The main nutrients that humans need are proteins, carbohydrates, fats, minerals and vitamins. A balanced diet containing all nutrients in proper quantities is necessary to maintain health, though diets vary between cultures, religions, geography and individuals.
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