Risks of surgery Risks of gastric bypass (gastric bypass gastric diversion) surgery Because the duodenum is a bypass, it is malabsorbed for iron and calcium, resulting in lower iron levels throughout the body and a predisposition to iron deficiency anemia. This is of particular concern for those patients who experience chronic blood loss during excessive menstruation or during hemorrhoidal bleeding. Women who are already at risk for osteoporosis after menopause should be aware that the procedure potentially carries the risk of increased bone calcium loss. The duodenum becoming bypassed has caused some patients to develop metabolic bone disease, resulting in bone pain, shortening, hunchback, and cracked ribs as well as hip bones. However, all of the above deficiencies can be managed through proper diet and vitamin supplementation. Vitamin B12 deficiency may cause chronic anemia. This problem can usually be solved by taking oral vitamin B12 pills or by injecting vitamin B12. If food from the stomach flows rapidly into the small intestine, it may cause a phenomenon called “dumping syndrome”. This can sometimes happen when too much sugar or too much food is consumed. Although there is usually no serious risk to your health, these results can be extremely unpleasant, including nausea, weakness, sweating, dizziness, and occasional diarrhea after eating. Certain patients should not eat any form of candy after surgery. In some cases, the effectiveness of the procedure is reduced if the gastric bursa is elongated and/or if the volume of the stomach initially left is greater than 15-30 ml. Special reminders from experts: both doctors and patients should realize that obesity is not a suboptimal state, but a chronic disease that must be treated effectively; secondly, the threat of obesity to patients is not obesity itself, but its concomitant morbidity, i.e. metabolic disorder syndrome. Therefore, after surgery, if the obesity complication has been cured or controlled and the weight loss has not reached the corresponding index, the surgery cannot be considered invalid or unsuccessful. If the metabolic disorder syndrome caused by obesity has been relieved or disappeared, even if the patient is still overweight or mildly obese, then the purpose of treatment has been achieved. Of course, if the weight reduction to the normal range is perfect, it can be our pursuit, but it cannot be considered as the standard. With the deepening of basic research and the improvement of clinical efficacy, it is foreseeable that bariatric surgery will return a healthy life to many obese patients in the near future.