THE ANTITHYROID EFFECT OF CERTAIN FOODS IN MAN AS DETERMINED WITH RADIOACTIVE IODINE1

Abstract
The antithyroid effect of 61 foods was tested in 100 subjects by using radioactive iodine. Rutabaga was found to possess the greatest antithyroid activity. Vegetables were more active than animal products and the most potent vegetable families were the Chenopodiaceae, Compositae, Cruciferae, Cupuliferae, Juglandaceae, Leguminosae, Rosaceae, and Umbelliferae. Cow''s milk, beef liver, and oysters also showed some activity. The active principle of rutabagas could be extracted from an aqueous soln. with ether and was contained in the water-soluble portion of this dried ether extract.