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Studies of Diet as a Factor in ¹³⁷Cs Metabolism by Rats¹

Department of Biology, University of New Mexico, Albuquerque, New Mexico

Rats fed semistarvation, high carbohydrate, high protein and high fat diets retained more ¹³⁷Cs than control animals 7 days after intraperitoneal injection of a single dose of the isotope. The primary effect of diet on cesium metabolism may have been modification of cesium excretion via urine and feces. There appeared to be a direct relationship between mass of fecal material and the amount of ¹³⁷Cs excreted in feces. Apparently diet variation changed the composition and amount of material in the intestinal lumen to which cesium could be adsorbed for subsequent excretion in feces. On the other hand, cesium excretion via urine seemed to be less dependent on the amount of urine produced. Varying the primary nutrients by feeding rats high protein, high carbohydrate or high fat diets resulted in increased or decreased affinity of some cells for cesium. These results are not readily explainable but may be due to shifts in the relative amounts of connective tissue present in the tissues studied.

Manuscript received 12 August 1968.