Absorbed iron is tenaciously bound to protein. The little excretion that occurs, as with shedding of the inner lining of the digestive tract (desquamation of the epithelium of the mucous membrane), cannot be correctly assessed. Iron passed in stool is mostly unabsorbed dietary iron; some iron is also -lost through the bile. Desquamation of the skin increases iron loss with sweating in the hot, humid climate of the tropics. The urinary loss of iron is negligible.
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