I believe that in the impression of many people, cancer is a very scary disease, because this disease always happens unknowingly, and there are almost no signs at first, and when one finds out, it is usually in the middle or late stage and starts to pose a threat to life. In the fear of this disease, we all try to avoid doing things that may cause cancer in our daily life, such as not eating or less eating foods that may cause cancer in Nasi, refusing first-hand and second-hand smoke, etc. However, there is another potential cancer-causing factor that many people overlook. Obesity is a very common social phenomenon today, which not only causes various obesity complications such as cardiovascular diseases, but also is a risk factor for many types of cancer. Many studies have pointed out that people with long-term obesity are significantly more likely to suffer from pancreatic cancer, colon cancer, endometrial cancer, esophageal cancer and more than 10 kinds of cancers, and for them, losing weight is fighting cancer. Researchers point out that obese people are often in a state of chronic inflammation, since it is inflammation, there are often some triggering events, which have an impact on various vascular events and even cancer; at the same time, the secretion of estrogen and insulin in the body of obese people are abnormal, many people have hyperinsulinemia, insulin insensitivity will also have cancer caused by hormone metabolism; in addition, the cytokines, even adipokines, and immune response of obese people are significantly higher than those of normal weight people. In addition, the cytokines and even adipokines of obese people, as well as the immune response, will have an impact on the internal and external metabolism of the cells themselves in the process of cell metabolism and growth. Obesity is a high risk factor for many cancers, so it is necessary to control obesity in order to reduce the occurrence of such cancers.