A moldy food, do not eat aflatoxin in fungi as carcinogenic substances, the toxin can induce liver cancer in humans, monkeys, rats and poultry, the shortest time required to cause cancer is 24 weeks. Prevention of fungal contamination of food, should pay attention to: 1, home storage of peanuts, corn, dried white potatoes, rice, millet, etc. must be dried and stored in a dry and ventilated environment. 2, moldy peanuts, dried potatoes, dried radish, etc. should be removed and discarded, human and animal poultry can not eat. 3, peanut oil and cottonseed oil should not be stored for a long time; when a large number of grain and oil, milk food suspected of fungal contamination, should ask the epidemic prevention station inspection, allowed to issue, sale or consumption. Second, animal and vegetable oils should not be eaten after the smell of harshness Stale oils contain a chemical component that can mutate the structure of proteins, resulting in the loss of normal function of the cells of mutated proteins and the transformation of cancer cells to the initial stage. In addition, there are chemical components of acid replication to accelerate the aging process. Therefore, animal and vegetable oils should not be stored for too long, and the oil that has deteriorated and produced a harsh taste should not be consumed. The food fried in harsh tasting oil not only tastes bad, but more importantly, it can lead to cancer and shorten life expectancy.