Body mass index (BMI) may not measure obesity accurately

Posted by: admin on: June 3, 2011

The scale of the obesity epidemic may be much worse than currently believed, because the usual measure, body mass index (BMI), is a very insensitive measure of excess body fat

Team@CMHF

  • In a single-center study, 66% of patients classified as obese on the basis of DEXA scanning had BMI values in the non-obese range.
  • Among more than 1,000 patients, 56% were obese according to the DEXA results, versus 20% using the standard BMI-based definitions.
  • Scoffing at BMI as the “baloney mass index,” Braverman said it’s “very likely that obesity is a much bigger epidemic than the 300 million people acknowledged by the World Health Organization.”
  • BMI is just a mathematical equation based solely on height and weight that is too general for diagnosing anything, especially in such an exacting field of clinicians.
  • If any endocrinologist would rely on math to calculate thyroid stimulating hormone, for instance, he would be laughed at,” Braverman said.
  • DEXA scans, on the other hand, provide a direct measurement of body fat percentage. It can spot fat exactly, in every part of the body.
  • It’s particularly effective, for that part of the population that is known as “thin-but-unfit.”
  • Their condition is known as normal-weight obesity, in which the BMI is low but they have a high percentage of body fat, especially compared with more favorable tissue like muscle.
  • These patients are at higher risk of dyslipidemia, as well as hypertension among men and cardiovascular disease among women.
  • The researchers concluded that BMI is a highly insensitive measure of obesity prone to under-diagnosis, while direct fat measurements are superior because they show distribution of body fat.
  • This means that we may have more health problems, as individuals are delaying treatment because they don’t think they’re obese,” he said. “They think they’re thin and ‘just a little flabby.”

More at http://www.health.am/ab/more/body-mass-index-bmi-may-not-measure-obesity-accurately/

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