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Related Experiment Videos

Weight changes in adult twins

R Fabsitz, M Feinleib, Z Hrubec

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1980
    PubMed
    Summary

    Genetic factors significantly influence adult weight changes. This study found substantial heritability for changes in body mass index (BMI) in male twins over decades, even after physical maturation.

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    Area of Science:

    • Behavioral genetics
    • Human physiology
    • Twin studies

    Background:

    • Previous research indicated genetic influence on growth (height and weight) in younger individuals.
    • Understanding adult weight regulation and its genetic underpinnings is crucial for public health.
    • Longitudinal data is essential for tracking changes in physiological parameters over time.

    Purpose of the Study:

    • To investigate the genetic contribution to weight changes in adult males over a longitudinal period.
    • To quantify the heritability of changes in body mass index (BMI) from young adulthood to middle age.
    • To determine if genetic influence on weight persists beyond physical maturation.

    Main Methods:

    • Longitudinal study of 514 pairs of US white male twin veterans.
    • Data compiled from military records, questionnaires, and physical examinations.
    • Calculation of Quetelet Index (BMI) at multiple age points; twin analyses used to assess genetic variance in BMI and BMI change.

    Main Results:

    • Cross-sectional analyses revealed significant genetic variance in Quetelet Index at different adult ages.
    • Longitudinal analyses demonstrated significant genetic variance for changes in Quetelet Index from induction to middle age (25+ years).
    • Heritability estimates for BMI change were substantial, ranging from 0.6 to 0.7.

    Conclusions:

    • Adult weight change is significantly influenced by genetic factors, even after reaching physical maturity.
    • These findings highlight the enduring role of genetics in maintaining or altering body weight throughout adulthood.
    • The study underscores the importance of considering genetic predispositions in understanding adult weight dynamics.

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