Walnuts hairy generally can not eat. Walnuts hairy, easy to infect a fungus called Aspergillus flavus, and Aspergillus flavus can produce a large number of aflatoxins and thus cause toxic damage to the human body and even carcinogenic, so hairy walnuts generally can not be eaten. Aspergillus flavus is a kind of common rotting mold widely distributed around the world, of which 30% -60% of the strains can produce aflatoxin. Aflatoxin is a highly toxic and highly toxic substances, can cause acute and chronic toxicity damage to the human body: acute toxicity is mainly manifested in the human intake of large doses of aflatoxin can appear after the liver parenchymal cell necrosis, bile duct epithelial cell hyperplasia, hepatic fat infiltration, and other acute lesions. Chronic toxicity is characterized by subacute or chronic damage to the liver, weight loss, and induction of hepatocellular carcinoma. Aspergillus flavus is the most carcinogenic chemical known. In order to prevent the production of Aspergillus flavus, it is best to store peach kernels, nuts and grains in an airtight and dry place, and not to eat moldy foods, especially moldy dried fruits, peach kernels and grains.