We know that many diseases are related to diet and lifestyle, such as cardiovascular diseases, gastrointestinal diseases, and even tumors. Although there is no direct evidence that prostate cancer is related to dietary habits and lifestyle, there are studies that show that changing poor lifestyle or dietary habits can significantly delay disease progression and prolong survival. How significant is this effect? The University of Massachusetts published an article in the Journal of Urology, a leading urology journal in the United States. The study was conducted on patients who had recurrence after radical prostatectomy. We know that the best indicator to detect prostate cancer progression is currently a blood test for prostate-specific antigen (PSA), and that progressive disease often shows an increase in PSA values. If the diet is kept unchanged, then the time to double the PSA elevation is 6 1/2 months. However, after they were guided to a low-fat diet, the time for PSA doubling was extended to 1.5 years. By changing their diet not only did they benefit their cardiovascular system, but more importantly the survival time for prostate cancer patients was nearly tripled. Another study by an American academic pointed out that a high-fat diet, especially one high in saturated fatty acids, increased the risk of prostate cancer by 10-15% compared to a low-fat diet. This shows that if prostate cancer patients want to improve their survival period, it is worthwhile to put some effort on their diet or lifestyle habits. The “Chinese Guidelines for the Diagnosis and Treatment of Urological Diseases”, edited by Professor Na Yanqun, director of the Institute of Urology at Peking University, is a book for professional urologists to study and guide their medical practice, which clearly states that patients with low-risk prostate cancer and those with advanced prostate cancer who are not suitable for medication or surgery can be treated with wait-and-see therapy, that is, no medication and no surgery. These patients can then make changes to their diet and lifestyle habits during the wait-and-see treatment process to positively address the progression of the disease. In this way, the progression of prostate cancer can be managed in some patients for 10 to 15 years. In fact, for every prostate cancer patient, no matter what treatment you take, it is always beneficial to eat a low-fat diet, control your intake of saturated fatty acids, use more vegetable oils, and change poor dietary and lifestyle habits. Asian countries such as Japan have a lower fat intake than Western countries, as well as a lower incidence of prostate cancer. However, once the Japanese immigrated to the United States, a diet high in animal fats increased the incidence of prostate cancer in this group of Japanese because of the change in diet. Soy consumption is thought to prevent breast cancer there, but there is actually research data to support that soy consumption can also prevent and even treat prostate cancer. In the 1980s, Japanese people living in Hawaii who consumed tofu five times a week had a 65% lower chance of developing prostate cancer than those who consumed it once a week. Similarly, studies have suggested that people who consume soy milk daily have a 70% lower chance of developing prostate cancer than those who never consume soy milk. In some animal studies, soy has been shown to treat prostate cancer or to slow its progression. Australian academics found that a diet rich in soy reduced PSA by 12.7%, while the control group in the opposite study had a 40% increase in PSA. The incidence of prostate cancer in Europe and the United States is generally lower than in Asian countries, a phenomenon that many scholars attribute to the consumption of soy products by Asian people. The daily intake of soy protein recommended by a prostate cancer research center in California is 35-40 grams. The normal daily intake of calcium is no more than 700 mg per person, and some studies have shown that the chance of prostate cancer increases significantly if the daily intake of calcium exceeds 2000 mg. Although some prostate cancer patients undergoing endocrine therapy are at risk of osteoporosis, calcium supplementation of 1000-1500g per day is appropriate. Milk products are rich in calcium, as well as spinach, figs, dried apricots, raisins, tofu, cabbage, kale and various beans. Eat more fruits and vegetables. Eating more than five kinds of fruits and vegetables a day can reduce the incidence of heart disease and various tumors. Although scientists have not studied what ingredients are involved in the anti-tumor process, eating more fresh vegetables and fruits is certainly beneficial to the body, and some so-called plant-derived ingredients and drugs that claim to be an alternative to eating fruits and vegetables are far worse than eating them directly. Different colors of food contain different vitamins and minerals, so try to eat different colors of food, fruits and vegetables on the market according to the color can be divided into five categories: such as tomatoes, watermelon, strawberries and water radish for red; purple grapes, blueberries and plums for purple; carrots, pumpkins, oranges, apricots and mangoes belong to the orange; pineapple, pears and bananas belong to the yellow; spinach, rape, cabbage, etc. belong to the Spinach, rape, cabbage, etc. are green. In addition, cruciferous plants contain a substance called sulforaphane, which is able to repair the damage caused by tumor secretions. Eating five different types of cruciferous plants each week may reduce the risk of prostate cancer. Cruciferous plants belong to the cabbage family, which includes cauliflower, amaranth, broccoli, cabbage, and various types of kale. But consuming cruciferous plants will not save the progression of prostate cancer, even so prostate cancer patients can benefit from consuming these vegetables to strengthen their bodies and reduce cardiovascular complications. The body relies on the production of free radicals in the body to defend itself against invading foreign substances such as bacteria. However, this defense can be destructive to the body’s cells if it becomes too large. Free radicals are produced at all stages of tumor development, so the use of antioxidants to reduce the production of free radicals can reduce the risk of tumor development. Some of the antioxidants that we can consume in our daily life to fight prostate cancer include vitamins and trace elements (such as vitamin E and selenium), lycopene, pomegranate juice, and green tea. One study has confirmed that a daily intake of 200 mg of selenium can reduce the incidence of prostate cancer, and there is currently a study being conducted on the relationship between selenium and prostate cancer that includes several thousand prostate cancer patients and is expected to be completed in five years. Foods rich in selenium include various nuts, bread, oats, chicken, and fish all contain varying amounts of selenium. Vitamin E has antioxidant properties and there is a lot of controversy about the preventive effect of this substance on prostate cancer. Some people say that more intake of vitamin E can prevent prostate cancer, while some scholarly studies do not support this view. Increasing your intake of vitamin E is best done through a variety of foods. If taking pills leads to overdose it can increase the burden on the heart. Foods high in the vitamin include dried fruits such as melons, green leafy plants, and vegetable oils. In Asia, where the incidence of prostate cancer is low, green tea is cited in relatively high amounts Green tea may be one of the preventive factors for prostate cancer. Green tea contains polyphenols, which are potent antioxidants. It is recommended that at least 6 cups of green tea be consumed daily to achieve prostate cancer prevention. In any case, daily consumption of green tea is good for health.