Generally we know influences of diet's balances or imbalances upon toxicants. Some actions appear with aflatoxins as shown by studies on rat, pig, calf, poultry, turkey and duckling. According to species considered, oral administration of aflatoxins reduces food consummation, Nitrogen balance, respiratory coefficient. Therefore those modifications may be induced by a decrease of foodstuffs ingestion. It has been underlined that hypoproteic diet increases intoxication and diet rich in lipotropic factors decreases it. The greatest number of experiments carried out are concerning vitamins A and D. Authors are recounting their own experimentations upon relationships between Ducklings, aflatoxicosis, retinol consumption and cholecalciferol deficiency. In Duckling, diet deficient in vitamin D increases aflatoxins toxicity. Some relations exist with cytochrome P 450.