Body mass index and all-cause mortality among older adults

Feon W. Cheng, Xiang Gao, Diane C. Mitchell, Craig Wood, Christopher D. Still, David Rolston, Gordon L. Jensen

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Objective: To examine the association between baseline body mass index (BMI, kg/m2) and all-cause mortality in a well-characterized cohort of older persons. Methods: The association between BMI (both as a categorical and continuous variable) and all-cause mortality was investigated using 4,565 Geisinger Rural Aging Study participants with baseline age 74.0 ± 4.7 years (mean ± SD) and BMI 29.5 ± 5.3 kg/m2 over a mean of 10.9 ± 3.8 years of follow-up. Results: The relationship between BMI (as a continuous variable) and all-cause mortality was found to be U-shaped (P nonlinearity <0.001). Controlling for age, sex, smoking, alcohol, laboratory values, medications, and comorbidity status, underweight (BMI <18.5 kg/m2) individuals had significantly greater adjusted risk of all-cause mortality than persons of BMI 18.5 to 24.9 kg/m2 (reference range). Participants with overweight (BMI 25.0–29.9 kg/m2) and class I obesity (BMI 30.0–34.9 kg/m2) had significantly lower adjusted-risk of all-cause mortality. Those with classes II/III obesity (BMI ≥ 35.0 kg/m2) did not have significantly greater adjusted-risk of all-cause mortality. Findings were consistent using propensity score weights and among never-smokers with 2- and 5-year lag analysis and among those with no identified chronic disease. Conclusions: A U-shaped association was observed between BMI and all-cause mortality with lower risk among older persons with overweight and class I obesity in comparison with those with BMI 18.5 to 24.9 kg/m2.

Original languageEnglish (US)
Pages (from-to)2232-2239
Number of pages8
JournalObesity
Volume24
Issue number10
DOIs
StatePublished - Oct 1 2016

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Nutrition and Dietetics

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    Cheng, F. W., Gao, X., Mitchell, D. C., Wood, C., Still, C. D., Rolston, D., & Jensen, G. L. (2016). Body mass index and all-cause mortality among older adults. Obesity, 24(10), 2232-2239. https://doi.org/10.1002/oby.21612