Patients who gained between 10 and 55lbs over the study cut their risk of premature death by a third.
The findings, presented at the 68th scientific sessions of the American Diabetes Association in San Francisco last week, followed-up 655 patients, aged an average of 28 at baseline, with type-1 diabetes for 20 years.
BMI and waist circumference measurements were taken every two years.
During follow-up, 147 participants died.
Diabetics who had a BMI over 30 were 33 per cent less likely to die than those with a normal BMI of 20 to 24.9.
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