People of normal weight with belly fat at highest death risk: study

August 27, 2012, Mayo Clinic

People who are of normal weight but have fat concentrated in their bellies have a higher death risk than those who are obese, according to Mayo Clinic research presented today at the European Society of Cardiology Congress in Munich. Those studied who had a normal body mass index but central obesity—a high waist-to-hip ratio—had the highest cardiovascular death risk and the highest death risk from all causes, the analysis found.

"We knew from previous research that central obesity is bad, but what is new in this research is that the distribution of the fat is very important even in people with a normal weight," says senior author Francisco Lopez-Jimenez, M.D., a cardiologist at Mayo Clinic in Rochester. "This group has the highest death rate, even higher than those who are considered obese based on body mass index. From a public health perspective, this is a significant finding."

The study included 12,785 people 18 and older from the Third National Health and , a representative sample of the U.S. population. The survey recorded such as height, weight, and hip circumference, as well as socioeconomic status, comorbidities, and physiological and laboratory measurements. were matched to the National Death Index to assess deaths at follow-up.

Those studied were divided by body mass index into three categories (normal: 18.5-24.9 kg/m2; overweight: 25.0-29.9 kg/m2; and obese: >30 kg/m2) and two categories of waist-to-hip ratio (normal: <0.85 in women and <0.90 in men; and high: ≥0.85 in women and ≥0.90 in men). Analyses were adjusted for age, sex, race, smoking, hypertension, diabetes, dyslipidemia and baseline body mass index. People with chronic obstructive pulmonary disease and cancer were excluded.

The mean age was 44; 47.4 percent were men. The median follow-up period was 14.3 years. There were 2,562 deaths, of which 1,138 were cardiovascular related.

The risk of was 2.75 times higher, and the risk of death from all causes was 2.08 times higher, in people of normal weight with central obesity, compared with those with a normal body mass index and waist-to-hip ratio.

"The high risk of death may be related to a higher visceral fat accumulation in this group, which is associated with insulin resistance and other risk factors, the limited amount of fat located on the hips and legs, which is fat with presumed protective effects, and to the relatively limited amount of muscle mass," says Karine Sahakyan, M.D., Ph.D., a cardiovascular research fellow at Mayo Clinic in Rochester.

Many people know their these days; it's also important for them to know that a normal one doesn't mean their heart disease risk is low, adds Dr. Lopez-Jimenez. Where their fat is distributed on their body can mean a lot, and that can be determined easily by getting a waist-to-hip measurement, even if their body weight is within normal limits, he says.

Explore further: A little belly fat can double the risk of death in coronary artery disease patients

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2 comments

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brucel
1 / 5 (1) Aug 28, 2012
So I can reduce my chance of death by sucking in my gut? Maybe people who suck in their gut whenever someone measures their waist also do something to have a healthier lifestyle? This doesn't sound right.
DonaldJLucas
not rated yet Sep 03, 2012
I vaguely recall reading somewhere about one year ago that the reason that belly fat is so bad for you is because it puts pressure on various hormone producing glands and organs in the abdomen and causes them to over-secrete or under-secrete hormones with the most optimal levels.

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