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Iron-deficiency in the tropics.

Different populations in the tropics show wide variation in their iron status, even when living in the same area. These differences range from the most profound iron-deficiency anaemia to nutritional haemosiderosis. The extremes of dietary iron content so far reported are 5 mg per day in Mauritius to 180 mg per day in Ethiopia. Contamination with inorganic iron is an important source in some communities. Generally, the iron in food is in excess of requirement, but lumenal factors are all important in deciding how much is available for absorption. The iron of some diets is readily absorbed, but in other only a small percentage is utilizable. Hookworm infection is the commonest cause of severe iron-deficiency in many parts of the world. Its prevalence and its density depends on social habits, and may vary considerably even within tribes. The development of iron-deficiency anaemia depends on the hookworm load being sufficient to cause iron loss in excess of available intake. Anaemia impairs work capacity, reproductive ability of women and the development of children, and has wide social and economic repercussions. An intramuscular preparation by which 500 mg of iron may be administered in one injection has most useful application in areas where medical care is minimal.