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absorbed absorption Addisonian anaemia adequate adolescence adult agricultural alcohol amounts animal protein Apartado ascorbic acid beriberi beta carotene biological blood body weight bones calcium calories joules kilo carbohydrate cells cereals chemical cholecalciferol countries cyanocobalamin daily intake deficiency dietary intake dietary protein disease distributed energy expenditure energy intake energy requirements enzymes essential amino acids essential nutrient excess excreted factor FAO/WHO Expert Group flour fluorine folate grams growth haemoglobin important increase infants iodine joules kcal kilogram of body lactation Libreria liver magnesium meat meet mega megaloblastic anaemia ments mg per day moderately active months mothers niacin niacin equivalents normal P.O. Box pellagra percent physical activity population pregnancy and lactation present protein intake protein needs protein requirements recommended intake retinol riboflavine rich source rickets scurvy small intestine thiamine tissues urine vegetable proteins vitamin B12 woman women zinc