Normal weight people with central obesity at increased risk for death, study finds

People with a normal BMI who carry their weight around the middle are at the highest risk of death from any cause compared to those who are overweight or obese but carry their weight elsewhere, Loughborough research has found.

For the study Professors Mark Hamer and David Stensel and Dr. Gary O'Donovan from the University's School of Sport, Health and Exercise Sciences measured 42,702 participants from 10 different years of the annual Health Survey for England and the Scottish Health Survey.

They wanted to see if a large-scale analysis would have similar results to previous smaller scale studies, which found normal-weight individuals with central obesity had the worst long-term survival, even when compared to overweight and obese participants with central obesity.

For the new study participants were categorized as normal weight; normal weight with central obesity; overweight; overweight with central obesity; obese; or obese with central obesity based on BMI and waist-hip ratio.

The researchers found that when compared with the normal weight participants without central obesity, only normal weight and obese people with central obesity were at increased risk for all-cause mortality. All participants with central obesity, regardless of BMI, were at increased risk for cardiovascular deaths.

Speaking about the findings Professor Mark Hamer said: "Our research does back up the findings of previous smaller scale studies which show normal-weight people with central obesity are at increased risk for all-cause mortality.

"It is yet further evidence that even if you are within a 'healthy' BMI range but you carry weight around your stomach your health is still at risk.  The message here is that if you do have central obesity, no matter what your BMI, you should take steps to reduce this fat."

The observational study was published this week in Annals of Internal Medicine.

The project was funded by the National Institute for Health Research (NIHR) Leicester Biomedical Research Centre (BRC), which is a partnership between Loughborough University, University Hospitals of Leicester NHS Trust and the University of Leicester. As part of BRC, Loughborough leads the 'Lifestyle theme', which focuses on physical activity behavior and obesity-related diseases.

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