A gastric bypass is a more extensive procedure than gastric banding. It enables weight loss by two simultaneous methods - restriction and malabsorption - thereby increasing the likelihood of successful weight loss.
For the seriously obese, the benefits of the gastric bypass procedure very much outweigh the risks. In general:
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After gastric bypass surgery there will be major improvements in a whole range of weight-associated conditions, including sleep apnoea, asthma, joint pain, arthritis, reflux, fatigue, shortness of breath.