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Related Experiment Video

Updated: Jul 24, 2025

Author Spotlight: Exploring the Impact of Reduced Resistance Exercise Volume on Metabolic Health
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Physical Activity, Sedentary Behavior, and Type 2 Diabetes: Mendelian Randomization Analysis.

Shuai Yuan1, Xue Li2, Qianwen Liu3

  • 1Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, 17165, Sweden.

Journal of the Endocrine Society
|July 7, 2023
PubMed
Summary

This study found that moderate-to-vigorous physical activity (MVPA) reduces type 2 diabetes risk, while leisure screen time (LST) increases it. These effects are linked to obesity, lean mass, and inflammation.

Keywords:
inflammationmendelian randomizationobesityphysical activitysedentary behaviortype 2 diabetes

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Area of Science:

  • Genetics
  • Epidemiology
  • Metabolic Diseases

Background:

  • The relationship between physical activity, inactivity, and type 2 diabetes risk is not fully understood.
  • Previous studies have yielded inconclusive results regarding causality and underlying pathways.

Purpose of the Study:

  • To investigate the causal associations of moderate-to-vigorous physical activity (MVPA) and leisure screen time (LST) with type 2 diabetes mellitus (T2DM).
  • To explore potential mediating pathways, including adiposity, lean mass, glycemic traits, and inflammation.

Main Methods:

  • Utilized a Mendelian randomization (MR) approach with large-scale genome-wide association study data.
  • Selected genetic variants for MVPA and LST as instrumental variables from over 600,000 individuals.
  • Analyzed T2DM data from 898,130 individuals and intermediate phenotypes from large cohorts.

Main Results:

  • Increased MVPA was associated with a reduced risk of T2DM (OR 0.70; P = .002).
  • Increased LST was associated with a higher risk of T2DM (OR 1.45; P = 7.62 × 10^-11).
  • Associations were partially mediated by adiposity indicators, lean mass, and C-reactive protein, with MVPA also influenced by fasting insulin.

Conclusions:

  • Establishes a likely causal link between higher MVPA and lower T2DM risk.
  • Suggests a causal role for increased LST in T2DM risk.
  • Highlights obesity, lean mass, and chronic inflammation as key mediating factors in these relationships.