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1. Rats fed on a protein-free high-carbohydrate diet for 7 days metabolized dimethylnitrosamine at only 55% the rate of rats fed on a commercial diet. 2. Dimethylnitrosamine was metabolized by liver slices from rats fed on the protein-free diet at less than half the rate attained by slices from rats fed on a commercial diet. But kidney slices from these rats metabolized dimethylnitrosamine at the same rate as kidney slices from rats on a commercial diet. 3. Methylation by dimethylnitrosamine (70mg/kg body wt.) of N-7 of guanine of the liver RNA and DNA of rats fed on a protein-free diet was only slightly higher than in rats fed on a normal diet given 27mg/kg body wt. In contrast, the methylation by dimethylnitrosamine of guanine in kidney nucleic acids of these rats was three times that in the rats fed on a normal diet. 4. In rats fed on a protein-free diet the incidence of kidney tumours produced by a single dose of dimethylnitrosamine is increased.

Cellular injury and carcinogenesis. The effect of a protein-free high-carbohydrate diet on the metabolism of dimethylnitrosamine in the rat