When you think of “tumor”, what do you think of, cancer? Even in the era of rapid development of medical technology, cancer can crush a family in an instant. However, who would have thought that such a desperate disease is actually related to obesity, which is often seen in our eyes? Studies have found that obesity and lack of exercise are associated with the development of breast cancer, colon cancer, kidney cancer, endometrial cancer, pancreatic cancer and many other tumors. In contrast, reducing weight and establishing good and healthy lifestyle habits can reduce the incidence of cancer. Although it is known that obesity can increase the chance of cancer, the deeper reasons come from various aspects, including the fact that fat cells in the waist can prompt human beings to produce growth hormone, which induces certain tumors and obesity and reduced exercise, which slows down intestinal peristalsis, slows down breathing and reduces the discharge of carcinogens. As the degree of obesity becomes more serious, the more abdominal fat accumulation, the incidence of cancer will also increase accordingly. Therefore, for patients with severe obesity, cancer prevention requires timely weight loss countermeasures. Gastric reduction surgery is a more suitable way for the severely obese to lose weight. The surgery can maintain the weight loss effect steadily for a long time, and after the implementation of gastric reduction surgery, patients can generally reduce their weight by 50% to 60%, and a long-term study of up to 14 years also shows that the effect brought by gastric reduction surgery is sustainable. When the body’s body mass index returns to normal, the chance of cancer also decreases dramatically, so gastric reduction surgery is of great importance in cancer prevention. Among the many bariatric surgeons in China, Drs. Wu Liangping and Dai Xiaojiang have more than 10 years of experience in the field. The primary surgeon plays an important role in the surgery, and an experienced and skilled surgeon can improve the safety and results of the surgery.