Although surgeons experienced in bariatric surgery can perform the procedures very quickly and easily, there is still a possibility of complications such as bleeding, infection, formation of thrombus which causes deep venous thrombosis or pulmonary embolization.
The possible complication specific to gastric bypass is the Dumping Syndromewhich causes diarrhea, vomiting and abdominal discomfort immediately after a meal. This may lead to the fear of eating in public places and other psychological and social problems.
Moreover, after gastric bypass malabsorption may occur. It helps losing extra weight but it also interferes with absorption of important substances (calcium, vitamins, iron) which are essential for one’s body, so extra nutritional supplements should be taken.
Because of gastric bypass characteristics this procedure cannot be performed on patients with ulcerative colitis, Crohn’s disease, anemia, or patients who have a very high level of obesity (BMI over 50 and more).
The main disadvantage of gastric sleeve is the fact that it is a fairly new procedure. As a result, it is less investigated as well as less studied.
Gastric sleeve is irreversible. Moreover, there is a chance to regain the lost weight or to lose only a small amount of weight.