AJCN 19th International Congress of Nutrition
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American Journal of Clinical Nutrition, Vol 21, 78-86, Copyright © 1968 by The American Society for Clinical Nutrition, Inc.

Pica in Turkey

II. Effect of Clay upon Iron Absorption

VIRGINIA MINNICH M.S.1, AYHAN OKÇUOGbreveLU M.D1, YAVUZ TARCON M.D1, AYTEN ARCASOY M.D.1, SÜHRÜ CIN M.D.1, ORHAN YÖRÜKOGbreveLU M.D.1, FEVZI RENDA M.D.1, and BAHTIYAR DEMIRAGbreve M.D.1

1 From the Department of Medicine, Washington University, St. Louis, Missouri, and the Departments of Pediatrics and Radiobiology, Tip Fakultesi, Cebeci, Ankara, Turkey

The effect of four varieties of clay and of one soil sample upon 59FeSO4 and 59Felabeled hemoglobin absorption was investigated in normal and iron-deficient subjects. The clays differed in effect depending upon their cation exchange capacity (CEC). Clay from Turkey with a high CEC was more effective in blocking iron absorption than were three clays with lower CEC values. Turkish clay also decreased the amount of 59Fe-labeled hemoglobin absorbed. The effect can be explained by time transitional nature of iron, which exchanges for Ca, Mg, Mn, Na, K, and H ions with the formation of nonabsorbable iron compounds.

Magnesium oxide was extremely effective in preventing iron absorption. The cation exchange capacity of antacids which contain magnesium compounds may have some clinical significance because of their reaction with iron

The effect of clay and soil on iron absorption may not be the sole factor in the production of anemia in geophagia, but it could be contributory. Nutritional and parasitic factors are usually involved as well.




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