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Diabetes Health Center

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Obesity's Link to Type 2 Diabetes Not So Clear-Cut

Most participants developed condition after being overweight for years, not after large recent gain

WebMD News from HealthDay

By Serena Gordon

HealthDay Reporter

WEDNESDAY, Feb. 12, 2014 (HealthDay News) -- Although it's a common belief that a diagnosis of type 2 diabetes often follows a large weight gain, a new study challenges that notion.

Researchers found that the majority of people diagnosed with type 2 diabetes didn't get the disease until they'd been overweight or obese for a number of years.

What's more, participants who maintained stable levels of overweight and eventually developed type 2 diabetes didn't have a significant rise in their level of insulin resistance -- a traditional risk factor -- before getting the disease.

"In general, the majority of individuals developing type 2 diabetes were rather weight stable during follow-up with a slightly higher average BMI [body mass index] than the diabetes-free population," wrote study author Dorte Vistisen, at the Steno Diabetes Center in Denmark, and colleagues.

BMI is an estimate of a person's body fat levels, based on height and weight.

The new findings suggest that "strategies focusing on small weight reductions for the entire population may be more beneficial than predominantly focusing on weight loss for high-risk individuals," the researchers concluded.

Results of the study are published in the February issue of the journal PLoS Medicine.

Obesity is a known risk factor for type 2 diabetes. However, the degree of obesity varies greatly in people with type 2, according to background information in the study. Not everyone who has type 2 diabetes is overweight or obese, and not everyone who is overweight or obese will develop type 2 diabetes, which suggests that there are other mechanisms involved.

The researchers wanted to see if different patterns of obesity might contribute to a greater risk of type 2 diabetes, or if other metabolic risk factors played a more important role.

The international team of authors reviewed data from a study of almost 7,000 British civil servants from 1991 through 2009. The average follow-up time was about 15 years.

At the start of the study, no one had type 2 diabetes. During the study time period, 645 people developed the condition.

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