Relationship between body fat and BMI in a US hispanic population-based cohort study: Results from HCHS/SOL

Obesity (Silver Spring). 2016 Jul;24(7):1561-71. doi: 10.1002/oby.21495. Epub 2016 May 17.

Abstract

Objective: To evaluate the percentage of body fat (%BF)-BMI relationship, identify %BF levels corresponding to adult BMI cut points, and examine %BF-BMI agreement in a diverse Hispanic/Latino population.

Methods: %BF by bioelectrical impedance analysis was corrected against %BF by (18) O dilution in 434 participants of the ancillary Hispanic Community Health Study/Study of Latinos. Corrected %BF was regressed against 1/BMI in the parent study (n = 15,261), fitting models for each age group, by sex, and Hispanic/Latino background; predicted %BF was then computed for each BMI cut point.

Results: Bioelectrical impedance analysis underestimated %BF by 8.7 ± 0.3% in women and 4.6 ± 0.3% in men (P < 0.0001). The %BF-BMI relationship was nonlinear and linear for 1/BMI. Sex- and age-specific regression parameters between %BF and 1/BMI were consistent across Hispanic/Latino backgrounds (P > 0.05). The precision of the %BF-1/BMI association weakened with increasing age in men but not women. The proportion of participants classified as nonobese by BMI but as having obesity by %BF was generally higher among women and older adults (16.4% in women vs. 12.0% in men aged 50-74 years).

Conclusions: %BF was linearly related to 1/BMI with consistent relationship across Hispanic/Latino backgrounds. BMI cut points consistently underestimated the proportion of Hispanics/Latinos with excess adiposity.

Trial registration: ClinicalTrials.gov NCT02060344.

MeSH terms

  • Adipose Tissue*
  • Adult
  • Age Factors
  • Body Mass Index*
  • Cohort Studies
  • Female
  • Hispanic Americans / statistics & numerical data*
  • Humans
  • Male
  • Middle Aged
  • Obesity / epidemiology
  • Obesity / etiology*
  • Regression Analysis
  • Risk Factors
  • Sex Factors
  • United States / epidemiology

Associated data

  • ClinicalTrials.gov/NCT02060344