A balanced diet, the digestive system, digestive enzymes, and absorption in the small intestine.
Food provides energy and raw materials; digestion breaks it into absorbable molecules.
A balanced diet
Contains carbohydrates, proteins, lipids, vitamins, minerals, fibre and water in the right proportions. Deficiencies cause problems (e.g. lack of vitamin C → scurvy; lack of iron → anaemia).
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