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Which Is Better: BMI or Body Adiposity Index?

by Ryan Halvorson on Jun 27, 2012

Making News

In related news, another measure is gaining acceptance when it comes to accurately detecting body fat. Unlike BMI, which uses height and weight to estimate body fat, the body adiposity index (BAI) does not take weight into account. Instead, it uses the following calculation: hip circumference (in centimeters) / height (in meters) (1.5) – 18. In a study published in the journal Obesity (2012; 20 [4], 900–903), scientists examined whether BAI is really a better body fat indicator than BMI. They compared DXA body fat percentage measures against both BMI and BAI data gathered from 623 adults. “In the sample as a whole, the agreement between BAI and body fat percentage was far better than between BMI and body fat percentage, but was nonetheless relatively poor,” the authors stated. They found that major discrepancies occurred between DXA and BAI among individuals with lower levels of body fat. BAI also tended to overestimate fat percentage in males and to underestimate fat percentage in females. “Results of the present study show that BAI provides a better indicator of adiposity in European-American adults than does BMI, but does not provide valid estimates of fat percentage, particularly at lower levels of body fatness,” concluded the authors.

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About the Author

Ryan Halvorson

Ryan Halvorson IDEA Author/Presenter

Ryan Halvorson is the chief content officer for Fit Scribe Media (www.fitscribemedia.com); contributing editor for IDEA Health & Fitness Association; director of group training at Bird Rock Fit in La Jolla, CA; a Master Instructor for Metabolic Effect and the creator of www.Fat2Fitin30.com, a lifestyle organization dedicated to finding ways to achieve improved fitness, nutrition and healthy living habits in 30 minutes or less. He is an internationally recognized speaker and has written for publications such as DETAILS and GQ.