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.