At present, malignant neoplasm is the first cause of death among the population aged 30 to 60 years old in China, and the incidence is trending younger. Food is closely related to the occurrence of cancer, about 30% of cancer deaths are related to dietary factors; on the one hand, the harmful components in food have carcinogenic and cancer-promoting effects, but on the other hand, many foods also have cancer-fighting and cancer-preventing effects. Common cancer-causing foods include: 1. Smoking: Smoking is the most serious cancer-causing dietary habit. More than 30% of all cancer deaths are directly attributed to smoking. Smoking can cause about 85% of lung cancer deaths, and the same lung cancer patients with a history of smoking are more likely to recur after surgery. Also, smoking is associated with the occurrence of and death from dozens of cancers. However, people often have a fluke mentality, thinking that they will not get cancer from smoking, and they give themselves all kinds of excuses, thinking that it is difficult to quit smoking, in fact, it is just a matter of thought. Medical science has proved that alcohol consumption is related to the development of many kinds of cancers, including: oral cancer, throat cancer, colon cancer and liver cancer. Ethanolic beverages, whether beer, wine, yellow wine or white wine, can induce cancer. There is a relationship between the occurrence of cancer and the amount of alcohol consumed. It is generally believed that a small amount of alcohol consumed occasionally has no significant role in inducing cancer, while the risk of cancer occurrence increases significantly in long-term alcoholics. For example, the risk of breast cancer in alcoholics is 1.5 times higher than that of non-drinkers or occasional drinkers, and the higher the amount of alcohol consumed, the higher the risk of breast cancer. We have also observed that alcohol consumption can also increase the recurrence of cancer patients. 3, pickled food: salted fish produces dimethyl nitrite, which can be transformed into carcinogenic substance dimethyl nitrite in the body. Salted eggs and salted vegetables also contain carcinogenic substances and should be eaten sparingly. 4, barbecue food: roast beef, roast duck, roast lamb, roast goose, roast suckling pig, roast lamb skewers, etc., should not be eaten because they contain strong carcinogens. 5.Smoked foods: such as bacon, smoked liver, smoked fish, smoked eggs, smoked dried tofu, etc. contain benzopyrene carcinogens and are prone to esophageal cancer and stomach cancer when eaten frequently. 6.Fried food: after frying, carcinogenic polycyclic aromatic hydrocarbons are produced. Oil pancakes, stinky tofu, doughnuts, etc., as most of them use repeated oil, carcinogenic substances will be produced under high temperature. 7, moldy substances: rice, wheat, beans, corn, peanuts and other foods are susceptible to moisture mold, contaminated by mold will produce carcinogenic toxins – aflatoxin. 8, overnight cooked cabbage and sauerkraut: will produce nitrite, which will be converted into carcinogenic amines nitrite in the body. 9.Betel nut: chewing betel nut is a factor that causes oral cancer. 10.Repeatedly boiled water: repeatedly boiled water contains nitrite, which will generate carcinogenic amine nitrite after entering the body. Common foods that can fight or prevent cancer: 1. Cruciferous plants: including cabbage, kale, mustard, radish, aquatic vegetables (lotus root, rhizome, Ulva, wild rice, watercress, cress, water chestnut, etc.). Research shows that cruciferous vegetables can reduce the risk of cancer, cardiovascular disease. 2, tomatoes: rich in antioxidants and lycopene, can effectively remove free radicals, to play a role in anti-cancer, cancer suppression. Regular consumption of tomatoes can reduce the risk of lung cancer, stomach cancer, bladder cancer, uterine cancer, skin cancer, prostate cancer. 3, spinach: is recognized as the green leafy vegetables in the golden vegetables. It is rich in lutein, vitamin E, antioxidants, regular consumption can prevent liver, ovarian, colon, prostate cancer. 4.Garlic: known as “the penicillin that grows in the ground”, it is rich in allicin and selenium and other trace elements, regular consumption is very helpful to prevent the deterioration of cancer and improve the body’s immunity. 5, strawberries: contains anthocyanins is a very strong antioxidant. Laboratory research shows that it can inhibit the growth of cancer cells such as lung cancer, colon cancer and blood cancer. 6, pumpkin and carrot: rich in carotenoids can play the role of antioxidants, by scavenging free radicals in the body to prevent lung cancer. Carotene can be converted into vitamin A, an indispensable nutritional element in the body, which can prevent normal cells from becoming cancerous. 7, olive oil: is a high-quality edible oil, rich in phytochemical antioxidants and vitamin E, with the role of preventing breast cancer and colon cancer. 8, pineapple: rich in protease, which can relieve sore throat and cough, treat arthritis and gout, and accelerate protein digestion. And a recent study also shows that the consumption of pineapple for the prevention and treatment of cancer is also very effective. 9, chili: known as the end of obesity. And in the fight against cancer, research shows that it can effectively stop or slow the growth of cancer cells. Here refers to the fresh large chili pepper. 10, shiitake mushroom: contains vitamin C, which can play a role in lowering cholesterol and blood pressure, and can more effectively inhibit and slow down the growth of cancer cells and reduce the side effects of cancer treatment. In addition, black fungus, konjac, broccoli, dates and many other foods have anti-cancer effects.