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Digestion begins in the mouth and continues in the stomach and is completed in the intestinal tract. Digestion is a catabolic function where proteins are metabolized into amino acids, carbohydrates into glucose and fats into fatty acids. Digestion is both a mechanical and chemical response. Eating slowly and thoroughly chewing, allows foods to be partially broken down, while stomachs acids and pancreatic, intestinal enzymes complete the process. Once the nutrients are small enough to pass through intestinal walls a series of hormonal responses start the anabolic process delivering the nourishment to the cells.

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