Medical research on carcinogenic substances in daily life has found that there are more than 10 kinds of chemicals with carcinogenic effects, among which nitrosamines, benzo(a)pyrene and aflatoxin are the three major recognized carcinogens, all of which are closely related to diet. Nitrosamines can cause tumors in almost all organs of human body, among which digestive tract cancer is the most common. Nitrosamines are commonly found in cereals, milk, cheese, alcohol and tobacco, bacon, roasted meats, sea fish, canned foods, and drinking water. Nitrite levels are higher in foods that are not fresh (especially vegetables that have been cooked for too long). Benzopyrene is mainly produced in the combustion process of coal, oil, natural gas and other substances, fat, cholesterol, etc. can also form benzo(a)pyrene at high temperatures, such as sausages and other smoked products in the benzo(a)pyrene content can be 60 times higher than ordinary meat. It has been proven that long-term exposure to benzo(a)pyrene can cause lung cancer, but also digestive tract cancer, bladder cancer, breast cancer, etc. Aflatoxin is the most potent carcinogen known. Medical doctors believe that aflatoxin is likely to be an important cause of liver cancer. In some areas with high incidence of liver cancer, people often eat fermented foods such as tofu milk and bean paste, which are prone to produce aflatoxin during the production process if the method is not appropriate. Food cancer ranking 1, barbecue food: roast beef, roast duck, roast lamb, roast goose, roast suckling pig, roast lamb skewer, etc. should not be eaten as they contain strong carcinogens. 2, moldy substances: rice, wheat, beans, corn, peanuts and other foods are susceptible to moisture mold, contaminated by mold will produce carcinogenic toxin – aflatoxin. 3, overnight cooked cabbage and sauerkraut: will produce nitrite, which will be converted into carcinogenic amines nitrite in the body. 4.Betel nut: chewing betel nut is a factor that causes oral cancer. 5.Repeatedly boiled water: repeatedly boiled water contains nitrite, which will generate carcinogenic amine nitrite after entering the body. 6, pickled food: salted fish produces dimethyl nitrite, which can be transformed into carcinogenic dimethyl nitrite in the body. Salted eggs, pickled vegetables, etc. also contain carcinogenic substances, should be eaten as little as possible. 7.Smoked food: such as bacon, smoked liver, smoked fish, smoked eggs, smoked dried bean curd, etc. contain benzopyrene carcinogens and are prone to esophageal cancer and stomach cancer when eaten frequently. 8.Fried food: after frying, carcinogenic polycyclic aromatic hydrocarbons are produced. When coffee is burnt, benzopyrene will increase 20 times. Deep-fried pancakes, stinky tofu, fried taro corner, doughnuts, etc. will produce carcinogens at high temperature because most of them use oil repeatedly. How to eliminate carcinogens in food 1, salted meat, sausages and other meat products, in the past is used to store one of the important means, modern in the city more will be seen as a flavor food, generally contains a small amount of nitroso compounds. Because the content is not high, in the consumption of soup fat can be discarded. But do not fry cooking. Because the synthesis of nitroso compounds can be promoted at high temperatures, so that the content of carcinogens such as nitrosopyrrolidine and dimethyl thiamine increased, therefore, daily life to avoid eating fried sausages and salted meat is very critical. At the same time in the consumption with some raw fresh vegetables and fruits is better. 2, salted fish contains more nitroso compounds, so it is best to boil it with water before consumption, or steam it, the soup should be removed not to eat. But some people use sunlight irradiation method, that can remove the nitroso compounds on the surface of the fish, but not much damage to the carcinogens deep in the fish body. For this reason, pay attention to the pre-processing of cooking, and with some raw vegetables and fruits is appropriate. 3, salt pickles in the processing of pre-processing without treatment, then salt pickles can contain a certain amount of nitroso compounds, generally people commonly used boiling, sunlight, hot water washing and other methods to achieve the purpose of eliminating carcinogenic. Among them, the best method or boiled in water, but the taste of pickled vegetables have an impact. If you add vitamin C in the right amount before pickling, it can also significantly reduce the content of nitroso compounds. More noteworthy: pickles with stale soup must not be used repeatedly.