Beneficial food groups: (1) Soy foods: An increase in the proportion of soy protein in the total protein of food leads to a significant reduction in the incidence of breast cancer in women. The potential risk of breast cancer in Asians who love soy foods is reduced by 17% to 73%, which is only 1/3 to 1/2 of that in Europe. (2) Dates: Dates can inhibit the formation of breast cancer cells because they contain a large amount of cyclic adenosine monophosphate and rich vitamins that can enhance the immune function of the body. (3) Garlic: Garlic can not only prevent breast cancer, but even treat it. Garlic has a significant inhibitory and killing effect on the formation of breast cancer cells, and it also activates and strengthens the body’s immune system, and eliminates cancer cells by promoting the growth of normal cells. (4) Wheat bran: A study conducted by the American Health Foundation on premenopausal women showed that wheat bran is beneficial in preventing breast cancer. Experts have found that eating food made with wheat bran every day can significantly reduce the size of precancerous polyps within six months. (5) Vegetables: Cauliflower, fennel, spinach, winter squash, cabbage, carrots and tomatoes can significantly reduce the incidence of breast cancer in premenopausal women because of the high amount of carotenoids that inhibit and kill cancer cells. (6) Vegetable oils: Peanut oil, corn oil, canola oil and soybean oil contain a large amount of unsaturated fatty acids, which have the effect of protecting premenopausal women from breast cancer. (7) Green tea: Regular consumption of green tea can prevent breast cancer because it contains hydroxyl compounds, which have a drug preventive effect on tumors. (1) Fat and high-calorie diet: Excessive intake of fat by middle-aged women can increase the risk of developing breast cancer, especially after menopause. A survey conducted in Shanghai shows that the relative risk of breast cancer increases for women who become fat, especially for women around 60 years old, and the risk of breast cancer increases by 80% for every 10 kg increase in body weight. Women who eat a lot of meat have a maximum risk of breast cancer of 103g/d, including processed foods (sausage, bacon, ham or pork chops) which may increase the risk of breast cancer by 64%. Even 57g of red meat carries this risk. Red meat is the main source of saturated fat. Women who eat more meat are more likely to gain weight. Vegetarians are half as likely to develop breast cancer. (2) Alcohol consumption: Women should promote less alcohol consumption because it increases the level of estrogen in women close to ovulation by 32%, thus increasing the risk of breast cancer. An interim analysis of 12 cases demonstrated a relative risk of 1.4 for every 24 g of alcohol consumed, and data from prospective studies further confirmed that alcohol consumption increases the risk of breast cancer. (3) Smoking: Dr. Pierre R. Bender and colleagues from Health Canada, Quebec, Canada, conducted a questionnaire survey on smoking and smoking age and found that women who started smoking within the first 5 years after menarche had a 70% higher risk of breast cancer than nonsmokers, independent of the duration of smoking. In contrast, women who started smoking after menopause did not have an increased risk of breast cancer. The researchers suggest that the breast tissue of adolescents may be susceptible to carcinogens and that the continued differentiation of breast tissue cells between pregnancy and full-term delivery makes women less susceptible to breast cancer, which may be one reason for the increased risk of breast cancer in women who smoke who have not yet had children.