The most common form of diabetes disappears in nearly 80 percent of obese diabetics after weight-loss surgery, researchers said in a study that strongly affirmed the benefits of the operations.

Obesity raises the risk for type-2 diabetes and the disease is becoming increasingly common in many parts of the world as more people become obese.

Evidence has been mounting that weight-loss operations such as gastric bypass surgery help many people with diabetes.

The researchers combined data from 621 studies worldwide with 135,246 patients and found that 78 percent of obese diabetics returned to normal blood sugar levels and had no symptoms of diabetes following weight-loss operations, also known as bariatric surgery.

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