More and more clinical cases prove that bariatric metabolic surgery has remarkable effects in treating obesity and type 2 diabetes, and it also improves the quality of life of patients to a greater extent, so it is an important tool for treating obesity and type 2 diabetes now and for a long time in the future. However, bariatric metabolic surgery is different from other surgical procedures because there are many factors that can affect the outcome of the surgery, such as the attending surgeon, postoperative care, surgical procedure, personal cooperation, and the timing of the surgery is also an important factor affecting the outcome of the surgery. Generally speaking, as long as patients meet the conditions for surgery, they can undergo surgery, and as long as the post-operative care is proper, the surgical effect will not be bad, but if the condition is too serious, it will lead to an increase in the risk of surgery, which is not good for doctors and patients themselves. From this point of view, the earlier the weight loss metabolic surgery is done, the better for health. However, this does not mean that the earlier the surgery is done, the better. For those patients who do not meet the conditions for surgery, such as those who are underweight or have uncorrected bad habits (such as alcoholism), it is not only difficult to achieve the expected surgical results, but also increases the probability of surgical complications. In the case of diabetes, for example, the insulin secretion ability of type 2 diabetic patients will slowly decrease with the increase of the disease time, which will lead to the increase of the requirements in living habits after the weight loss metabolic surgery. And if complications arise, it may also cause more serious effects. However, the system of bariatric metabolic surgery in China is constantly improving, and our physicians will conduct a detailed examination and evaluation before performing surgery on patients, and for patients with serious conditions, a multidisciplinary comprehensive discussion will be held to develop a surgical plan and perform the surgery in close cooperation with various departments, which provides an additional insurance for patients’ safety.