The measurement of appetite, and the effect of medical treatments on appetite is complex. In short most bariatric operations reduce appetite, which is one of the major differences between weight loss surgery and going on a prolonged diet.
For several weeks to months after most surgery on the stomach, patients describe a marked reduction in appetite, however this can and usually does return to normal. Patients after sleeve gastrectomy are the most likely to describe a persisting reduction in appetite. This is because the part of the stomach that secretes one of the hunger hormones is resected. The more noticeable clinical benefit for patients after the other common types of bariatric surgery is the effect on satiety. This refers to the sensation of being full, or satisfied or comfortable after a meal.
For patients with a gastric band, this is probably related to the reduced speed of eating. For patients after sleeve gastrectomy and bypass this is related to the vastly reduced size and elasticity of the remaining stomach.
This feeling of satiety is thought to be a major reason why sustained weight loss is more likely after surgery, than with dieting alone (where people often feel persistently hungry).
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