The use of gastric surgery to treat obesity and its medical complications should be greatly expanded, the BA Festival of Science in Liverpool heard on Monday.

Clinical researchers told the meeting, organised by the British Association for the Advancement of Science, that the gastric bypass operation, which makes the stomach smaller and removes part of the bowel, was the only effective treatment for obesity. It can also cure type-2 diabetes, the most serious complication of being seriously overweight.

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