BMI ‘Vastly Underestimates’ True Weight problems
3 min read
Twice as many US adults have obesity primarily based on evaluation of their fats quantity by DEXA scan in contrast with measurement of physique mass index (BMI), a discovering that highlights the shortcomings of BMI and provides to the rising case that BMI alone shouldn’t be the default gauge for weight problems.
“BMI vastly underestimates true weight problems,” Aayush Visaria, MD, stated at ENDO 2023: The Endocrine Society Annual Assembly.
His findings spotlight that “BMI ought to be supplemented with different measures of weight problems” for the administration of particular person sufferers, with assessments that would embody a bioelectrical impedance scale or waist circumference, stated Visaria, who’s a researcher at Rutgers Robert Wooden Johnson Medical Faculty in New Brunswick, New Jersey.
Visaria cited a new policy issued by the American Medical Affiliation a few days earlier than his presentation, as reported by Medscape Medical Information, which advises that BMI “be used together with different legitimate measures of threat equivalent to, however not restricted to, measurements of visceral fats, physique adiposity index, physique composition, relative fats mass, waist circumference, and genetic/metabolic elements.”
“We’re in the beginning of the tip of BMI,” declared Visaria throughout a press briefing on the ENDO assembly.
He stated that dual-energy X-ray absorptiometry (DEXA) is just not sensible nor cost-effective for weight problems screening in routine observe. Due to this fact, he predicts that waist circumference, usually expressed as waist-to-height ratio, can be measured extra usually, though he acknowledged that waist measurement may be tough. Nevertheless, higher doctor coaching on the measure ought to assist it grow to be the norm.
One other great tool for weight problems measurement he foresees shortly changing into widespread is toilet scales that file each weight and physique fats share utilizing a small electrical present to make a bioelectrical impedance measure of adiposity.
Bioimpedance scales will present extra standardized measurements than waist circumference and “revolutionize how we measure weight problems,” Visaria predicted. They’re “very accessible and low-cost,” he famous, with many fashions offered for lower than $100.
Weight problems Prevalence of 74%
The examine by Visaria and colleagues used information from 9784 US adults ages 20-59 years (common age, 39 years) collected in a number of Nationwide Well being and Vitamin Examination Surveys in 2011-2018. All these members underwent DEXA evaluation of their whole physique fats in addition to a BMI calculation.
Utilizing normal weight problems cutoffs for each BMI and whole physique fats, Visaria discovered that DEXA rated 74% of members as having weight problems primarily based on physique fats in contrast with 36% primarily based on BMI.
Among the many 64% of the examine group who weren’t overweight by BMI, DEXA scans confirmed 53% of this subgroup did have weight problems primarily based on physique fats content material. Amongst these with a standard BMI, 43% had weight problems by DEXA outcome.
Additional evaluation confirmed that when Visaria added waist circumference to BMI to enlarge the diagnostic internet for weight problems it reduce the proportion of adults missed as having weight problems by BMI alone almost in half.
Extra analyses confirmed that the speed of missed diagnoses of weight problems by BMI was solely commonest amongst folks of Hispanic or Asian ethnicity, with each teams displaying a 49% price of weight problems by DEXA amongst these with normal-range BMIs.
The speed of missed weight problems diagnoses was highest amongst all ladies, with a 59% prevalence of weight problems by DEXA amongst ladies with a normal-range BMI.
The examine acquired no industrial funding. Visaria has reported no related monetary relationships.
ENDO 2023. Summary OR10-01. Introduced June 16, 2023.
Mitchel L. Zoler is a reporter for Medscape and MDedge primarily based within the Philadelphia space. @mitchelzoler
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