Mixed
Engaging in at least 30 minutes of moderate physical activity on five or more days per week reduces the risk of breast and colon cancers, with 45 minutes or more providing further enhancement.
Aim for at least 30 minutes of moderate activity (like brisk walking) on five or more days a week. If you can, increase this to 45 minutes of moderate-to-vigorous activity for greater breast and colon cancer protection. Break it up into 20-30 minute sessions if needed.
Adults: engage in at least moderate activity for 30 minutes or more on five or more days of the week; 45 minutes or more of moderate-to-vigorous activity on five or more days per week may further enhance reductions in the risk of breast and colon cancer.
Why this rating
Based on extensive review by the WHO and consistent epidemiological evidence, though optimal intensity/duration questions remain.
Source
American Cancer Society Guidelines on Nutrition and Physical Activity for Cancer Prevention: Reducing the Risk of Cancer with Healthy Food Choices and Physical Activity
T. Byers et al. · CA A Cancer Journal for Clinicians · 2002
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