Hundreds of people under the age of 25 underwent weight loss surgery in the last three years, a major study has found. The National Bariatric Surgery Registry said 108 men and 462 women aged 24 or under had obesity operations between 2011 and 2013, including 62 people under the age of 18. It found more than 65% of obese patients with type two diabetes showed no sign of the condition two years after weight loss surgery, which includes gastric band, gastric bypass and sleeve gastrectomy operations.