protein - growth and repair, sugar - heat and energy , starch - Slow release of energy, fibre - causes peristalsis and prevents constipation, fat - heat, energy and insulation, unsaturated fat - lowers cholesterol, vitamin A - healthy lining tissues and good eyesight, vitamin B - healthy nervous system , folic acid - prevents spina bifida, vitamin C - healthy immune system , vitamin D - strong teeth and bones, calcium - strong bones and teeth, iron - makes haemoglobin in the red blood cells, sodium - normal fluid balance, water - prevents dehydration , energy - needed to do activities and exercise,

functions of nutrients

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