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Related Experiment Videos

Relationships between the Body Mass Index and body composition

R I Wellens1, A F Roche, H J Khamis

  • 1Department of Community Health, Wright State University, Dayton OH 45387, USA.

Obesity Research
|January 1, 1996
PubMed
Summary

Body Mass Index (BMI) is an uncertain measure of obesity. This study found BMI is a poor proxy for body fat percentage, especially in lower BMI ranges, and suggested new diagnostic cutoffs for obesity screening.

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Area of Science:

  • Human Physiology
  • Anthropometry
  • Body Composition Analysis

Background:

  • Body Mass Index (BMI) is widely used to assess weight status.
  • However, its accuracy as a proxy for body fat percentage (%BF) is debated.
  • Understanding BMI's relationship with fat-free mass (FFM) is crucial for accurate health assessments.

Purpose of the Study:

  • To evaluate Body Mass Index (BMI) as a proxy for percent body fat (%BF).
  • To determine the association between BMI and fat-free mass (FFM).
  • To identify optimal BMI screening cutoffs for obesity using densitometry data.

Main Methods:

  • Utilized multivariate analysis of variance and partial correlations.
  • Analyzed data from 504 men and 511 women (aged 20-45 years).

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  • Performed sensitivity/specificity analyses and Receiver Operator Characteristic (ROC) analyses.

    • Main Results:

    • BMI showed stronger associations with %BF in higher BMI tertiles.
    • In lower BMI tertiles, BMI correlated more strongly with FFM than %BF.
    • BMI correctly identified only 44% of obese men and 52% of obese women based on %BF.

    Conclusions:

    • BMI is an uncertain diagnostic index for obesity.
    • Current BMI cutoffs may misclassify individuals' body fat levels.
    • Recommended BMI screening cutoffs for obesity are 25 kg/m2 for men and 23 kg/m2 for women.