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Related Experiment Videos

Weight, smoking, and mortality.

J P Vandenbroucke, B J Mauritz, A de Bruin

    JAMA
    |November 23, 1984
    PubMed
    Summary

    This study confirms a U-shaped link between body mass index (BMI) and mortality, indicating both underweight and overweight individuals face increased risks. This relationship persists even after accounting for factors like smoking.

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    Area of Science:

    • Epidemiology
    • Public Health
    • Biostatistics

    Background:

    • Conflicting research exists regarding the association between body composition and mortality risk.
    • Previous studies suggested increased mortality for overweight individuals, while others indicated heightened risk for the very lean.
    • The precise nature of the relationship between body mass index (BMI) and all-cause mortality remained debated.

    Purpose of the Study:

    • To investigate the relationship between body mass index (BMI) and long-term mortality.
    • To clarify the shape of the association between BMI and mortality, specifically examining risks at both extremes of the BMI spectrum.
    • To determine if cigarette smoking confounds the observed relationship between low BMI and increased mortality.

    Main Methods:

    • Reanalysis of a 25-year follow-up study.
    • Inclusion of 1,503 men and 1,464 women, initially aged 40 to 65 years.
    • Statistical examination of mortality rates across different body mass index (BMI) categories.

    Main Results:

    • Confirmed a U-shaped relationship between body mass index (BMI) and mortality.
    • Identified significantly higher mortality rates among individuals in the lowest BMI category (underweight).
    • Observed increased mortality risk for individuals in higher BMI categories (overweight/obese).
    • Found that cigarette smoking did not account for the elevated mortality risk associated with the lowest BMI.

    Conclusions:

    • Both underweight and overweight body mass index (BMI) categories are associated with increased mortality risk.
    • The U-shaped curve highlights that optimal mortality risk lies within a specific intermediate BMI range.
    • The increased mortality in the leanest individuals is not solely explained by smoking, suggesting other underlying factors.

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