The authors carried out morphological and morphometric studies of the liver of rats under malnutrition and chronic aflatoxin intoxication for 2 and 7 months. Malnourished animals demonstrated atrophic alterations. Animals exposed to aflatoxin B1 manifested severe dystrophic and necrobiotic alterations which did not depend on the nutrition regimen. In rats administered aflatoxin, blastomic processes were identified only at the 7th month. Whatever the diet.