Salted fish: Dimethyl nitrite produced by salted fish can be converted into carcinogen dimethyl ammonium nitrite in the body. Shrimp sauce, salted eggs, pickles, sausages, ham and smoked pork also contain carcinogens and should be eaten as little as possible.
Barbecue food: roast beef, roast duck, roast mutton, roast goose, roast suckling pig, roast lamb kebabs, etc. Because of its strong carcinogenicity, it is not edible.
Smoked food: such as bacon, smoked liver, smoked fish, smoked eggs, smoked dried tofu and other carcinogens containing benzopyrene, which are prone to esophageal cancer and gastric cancer.
Fried food: After frying and burning, polycyclic aromatic hydrocarbons (PAHs) will be produced. After coffee is burnt, benzopyrene will increase by 20 times. Oil cake, stinky tofu, fried taro horn, fried dough sticks, etc. Because most of the repeated oils are used, carcinogens will be produced at high temperature.
Moldy substances: rice, wheat, beans, corn, peanuts and other foods are easy to get wet and moldy, and will produce carcinogenic toxin aflatoxin after being contaminated by mold.
Cooked vegetables and pickled vegetables overnight: nitrite will be produced, which will be converted into carcinogenic ammonium nitrite in the body.
Betel nut: chewing betel nut is a factor leading to oral cancer.
Repeatedly boiled water: Repeatedly boiled water contains nitrite, which forms carcinogenic ammonium nitrite after entering the human body.
Ham and lactic acid drinks are easy to cause cancer-people who mix sandwiches and yogurt for breakfast should be careful. Ham and bacon in sandwiches are easy to cause cancer when eaten with lactic acid drinks. In order to preserve meat products, food manufacturers will add nitrates to prevent food spoilage and Botox growth. Nitrate will be converted into carcinogenic nitrosamines when it meets organic acids.
(1) The natural carcinogens in food mainly include nitroso compounds, fatty substances and high-concentration alcohol. Among them, the content of nitroso compounds precursors is high in stale foods such as rotten foods. When people suffer from atrophic gastritis or insufficient gastric acid secretion, the stomach synthesizes the precursors of nitroso compounds into nitroso compounds.
(2) Carcinogens in food pollutants mainly include:
Household pesticides and household detergents may contain carcinogenic compounds, and food that comes into contact with them may be contaminated.
Some hormone preparations can enter edible poultry and livestock through veterinary treatment or feed additives, thus inducing endocrine system-related tumors.
Some food packaging materials contain polycyclic hydroxyl substances, which are potentially carcinogenic. Such as food packaging bags, wrapping paper, etc.
Carcinogens in the air accumulate in food through soil and water.
(3) Additives in food, such as preservatives, food pigments, spices, flavoring agents and nitrosamines contained in other additives.
(4) Carcinogens produced during food processing and storage. Smoked food and pickled food contain a large number of aromatic hydroxyl carcinogens, and aflatoxin contained in moldy rice, corn and beans has a strong carcinogenic effect on people and animals.
First, natural carcinogens in food.
(1) nitroso compound
It is a common carcinogen in food. It can be synthesized from precursors (amine, nitrite and nitrate) in animals, human body, food and environment. These precursors can appear in various foods, especially inferior and stale foods, such as leftovers and rotten vegetables. The main part of human body to synthesize nitroso compounds is stomach, especially when atrophic gastritis or gastric acid is insufficient, it can be synthesized by nitrite swallowed by saliva and amines in food, and nitroso compounds have been detected in gastric juice of animals and people.
(2) The study of high-fat diet found that long-term high-fat diet is prone to breast cancer, uterine cancer and colorectal cancer. This is particularly evident in some developed countries.
(3) High-concentration alcohol is a surface disinfectant. High-concentration alcohol can denature protein on the surface of digestive tract mucosa, thus increasing the incidence of tumor.
Second, carcinogens in food pollutants
(1) Polycyclic aromatic hydrocarbons (PAHs) in the atmosphere can pollute many foods and have been proved to be carcinogenic, especially benzopyrene. Most of these substances come from the pollution of heating system, industrial system and transportation. These substances can accumulate in food not only through the atmosphere, but also through water and soil.
(2) Many foods such as grains, fruits and vegetables can be contaminated by pesticides, and pesticides and detergents commonly used in life may contain carcinogenic compounds.
(3) Some hormone preparations can be treated by veterinarians or fed into animals. When people eat these livestock and poultry, they can ingest the hormones remaining in these livestock and poultry. Observation shows that both estrogen and progesterone can induce tumors related to endocrine system.
(4) Some food packaging materials, such as plastic bags, paper printed with words and patterns, and paraffin wax on packaging boxes, may contain polycyclic aromatic hydrocarbons, which are potentially carcinogenic.
Three, carcinogens in food additives
Food additives include preservatives, food pigments, spices, flavoring agents and other additives. At present, many bagged foods on the market contain preservatives, and the preservatives contain a lot of nitrosamines, which has obvious cancer promotion effect.
Carcinogens produced during food processing, storage and transportation.
In smoked food and pickled food, there are a large number of carcinogens polycyclic aromatic hydrocarbons. Moreover, high concentration of salt can not only reduce the concentration of gastric mucus protein, but also destroy the protective effect of gastric mucus barrier, so that carcinogens entering the digestive tract can directly enter the gastric mucosa, thus inducing cancer; On the other hand, high-salt food can also cause gastric ulcer and cause cancer. Sauerkraut contains a lot of nitrate and nitrite. These substances can combine with secondary amines in amines under certain conditions to produce nitrosamine compounds with strong carcinogenicity. Amines not only exist in large quantities in nature, but also molds can greatly increase the content of secondary amines in food.
Improper storage and transportation of food may lead to mildew. Aflatoxin contained in moldy rice, corn and peanuts has a strong carcinogenic effect on people and animals.