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Gastric surgery has 'immediate effect' on weight-loss

13 April 2011 Last updated at 07:56 BST

Gastric surgery has an "immediate effect on weight loss" which can help reduce type 2 diabetes, surgeon Alberic Fiennes told the BBC.

The UK's first large-scale study on the impact of weight-loss surgery has reported that a year after surgery, the cases of type 2 diabetes fell by 50%, and on average patients lost nearly 60% of their excess weight.

The report by the National Bariatric Surgery Registry examined the impact of 7,045 operations carried out over two years.