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‘Healthy' obese still face higher heart disease risk
Published in Ahram Online on 26 - 03 - 2017

Even without high blood pressure or other signs of illness, obese adults have a much higher risk of developing heart disease than normal-weight peers, according to a study from Denmark.
The results contradict recent research suggesting a subgroup of obese individuals known as “metabolically healthy obese” may not face an increased risk for obesity-related complications such as heart or kidney disease, researchers write in the Journal of Clinical Endocrinology and Metabolism.
“People have a general understanding now that it is not unhealthy to be overweight or obese as long as your lifestyle is relatively healthy,” said senior study author Kristine Faerch of the Stene Diabetes Center in Copenhagen.
“But overweight and obesity is associated with a high risk of developing type 2 diabetes and cardiovascular disease,” she told Reuters Health by email. “Maintaining a healthy weight through life is important to lower risk.”
Faerch and colleagues analyzed data for more than 6,200 men and women who participated in a large Danish study and were followed for at least 10 years.
They looked at participants' starting body mass index (BMI), a measure of weight relative to height. BMI of less than 24.9 kilograms per square meter was considered normal weight, BMI of 25 to 29.9 was considered overweight and BMI of 30 or above was considered obese. Someone 5 feet 9 inches tall and weighing 210 pounds, for example, would have a BMI of 31.
The researchers also looked at four heart disease risk factors at the beginning of the study and at periodic follow-ups: low HDL ("good")cholesterol, and elevated blood pressure, triglycerides and blood sugar. Metabolically healthy individuals were defined as having none of these risk factors, and metabolically unhealthy individuals had at least one.
During the follow-up period, 323 participants developed heart disease. Men who started out metabolically healthy and obese had three times the risk compared to metabolically healthy normal-weight men. Metabolically healthy obese women had double the risk of their normal-weight counterparts.
Men who were metabolically healthy and overweight, but not obese, at the outset had the same risk as healthy normal-weight men, and risk was only slightly increased for metabolically healthy overweight women.
Researchers also factored into their calculations any changes in metabolic health status over the course of the study. Just 58 men and 114 women, or 3 percent of the study population, qualified as “metabolically healthy obese” at the start. And 40 percent of these became metabolically unhealthy during a five-year period.
“What this study shows, before even looking at outcomes, is how rare a strictly healthy type of obesity is in the first place,” said Joshua Bell of the University of Bristol in the UK, who wasn't involved with the Danish study. “(It's) about 1 in 10 obese adults, and like we've found in previous studies, this status is often temporary.”
Bell and colleagues published research in the International Journal of Obesity in February that suggests obesity also hastens age-related functional decline and disability, even in metabolically healthy adults.
“As important as heart disease is, it's not the only aspect that can go wrong,” he said. “We also need to consider musculoskeletal impairments and other outcomes that affect quality of life,” he told Reuters
Bell's team found that during two decades of aging, physical function declined two times more and body pain increased six times more in so-called healthy obese adults compared to normal-weight adults.
“This will become increasingly important as more people live with obesity for longer as we get better at controlling heart disease,” Bell said.
Future research may also focus on different definitions of metabolically healthy obesity, said Matthias Schulze at the German Institute of Human Nutrition in Potsdam-Rehbruecke who wasn't involved with either study. Instead of body mass index, measurements could use waist circumference, waist-hip ratio or body fat distribution, he noted.
“We know now that the healthy state can change to the unhealthy state quickly over the course of a few years,” Schulze said by email. “The question now is - what can we do to reduce risk in both groups?”


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