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Related Experiment Video

Updated: Jan 6, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
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Consistent Adherence to Physical Activity Guidelines and Digestive System Cancer Risk and Mortality.

Yiwen Zhang1,2, Dong Hoon Lee1,3, Leandro F M Rezende4,5

  • 1Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts.

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Summary
This summary is machine-generated.

Consistently meeting physical activity guidelines (≥7.5 metabolic equivalent task [MET]-hours/week) over decades significantly lowers digestive system cancer (DSC) risk. Moderate, long-term adherence (around 17 MET-hours/week) provides optimal benefits, with higher amounts showing no additional advantage.

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Area of Science:

  • Epidemiology
  • Public Health
  • Oncology

Background:

  • Physical activity is linked to reduced digestive system cancer (DSC) risk.
  • Optimal physical activity levels and long-term consistency for DSC prevention remain unclear.

Purpose of the Study:

  • To investigate the association between physical activity levels, consistency, and DSC risk and mortality.
  • To determine the optimal amount and long-term adherence to physical activity for reducing DSC risk.

Main Methods:

  • Population-based cohort study utilizing data from three large US prospective cohorts.
  • Leisure-time physical activity assessed via biennial questionnaires (MET-hours/week); consistency calculated as percentage of follow-up years meeting guidelines (≥7.5 MET-hours/week).
  • DSCs included cancers of the digestive tract and accessory organs; follow-up up to 32 years.

Main Results:

  • Higher physical activity levels were associated with lower DSC risk and mortality.
  • Optimal risk reduction was suggested at ~50 MET-hours/week in traditional dose-response analysis.
  • Consistently meeting moderate activity levels (~17 MET-hours/week) over 3 decades significantly reduced DSC risk, with no added benefit from higher amounts (~38.5 MET-hours/week).

Conclusions:

  • Long-term consistency in physical activity is crucial for optimal digestive system cancer risk reduction.
  • Maintaining moderate physical activity levels (~17 MET-hours/week) consistently over decades offers substantial benefits for preventing DSCs.