In the latest issue of The Lancet, researchers warned that these victims would suffer longer from complications of type 2 diabetes, die sooner than people in other regions and that the epidemic may overwhelm healthcare systems in Asia.

"The increase in type 2 diabetes in Asia differs from that reported in other parts of the world; it has developed in a much shorter time, in a younger age group, and in people with a much lower body mass index," the researchers wrote.

Body mass index (BMI) is a measure of body fat based on height and weight.

The authors blamed the epidemic on fast-changing behaviour patterns, such as fast food and a sedentary lifestyle, and said lifestyle modifications must be made at once.

"Preventive action should begin urgently and lifestyle changes such as weight control and exercise are the first step," it said. It called on governments to implement well-targeted, clear action plans.

By 2025, 333 million people worldwide will be afflicted with diabetes, up from 194 million now, they said, citing figures from the International Diabetes Foundation.