HEALTH AND WELLNESS: How Being in Nature is Preventative of Cancer and Other Illness'

Spending time in nature is preventative of cancer and other illness in that it may reduce cancer and other illness’ risk indirectly by influencing biological, behavioral, and environmental factors that are known to affect cancer development. Here’s how nature exposure is thought to be protective rather than curative.

1. Reduces chronic stress and inflammation

  • Chronic stress increases cortisol and inflammatory markers, which can promote DNA damage and tumor growth.

  • Time in nature (parks, forests, green spaces) consistently lowers stress hormones and reduces systemic inflammation.

  • Lower inflammation = fewer conditions that allow cancer to develop or progress.

Key idea: Cancer thrives in chronically inflamed environments.

2. Strengthens immune function

  • Studies on “forest bathing” (Shinrin-yoku) show increases in natural killer (NK) cells, which help detect and destroy abnormal or pre-cancerous cells.

  • These immune benefits can persist for days to weeks after nature exposure.

Key idea: A stronger immune system is better at eliminating early cancer cells before they grow.

3. Improves sleep quality

  • Exposure to natural light helps regulate circadian rhythms.

  • Poor sleep and circadian disruption are associated with increased risks of breast, prostate, and colorectal cancers.

  • Nature exposure encourages healthier sleep patterns, indirectly lowering risk.

4. Encourages physical activity

  • People are more likely to walk, hike, cycle, or be active in green spaces.

  • Regular physical activity:

    • Lowers insulin resistance

    • Reduces body fat (fat tissue produces cancer-promoting hormones)

    • Lowers risk of several cancers (breast, colon, endometrial)

Key idea: Nature makes healthy movement more sustainable and enjoyable.

5. Reduces exposure to harmful pollutants

  • Green spaces generally have:

    • Lower air pollution

    • Less noise pollution

  • Air pollution is linked to lung cancer and may contribute to other cancers via oxidative stress.

6. Improves mental health and health behaviors

  • Nature exposure reduces depression and anxiety, which can:

    • Improve adherence to healthy behaviors (nutrition, exercise, medical screening)

    • Reduce smoking, alcohol misuse, and other high-risk coping behaviors

7. Possible effects of plant-derived compounds

  • Trees and plants release phytoncides (volatile organic compounds).

  • These compounds may have immune-boosting and anti-inflammatory effects, though research is still emerging.

Important perspective

  • Nature is preventative, not a treatment.

  • It works by lowering risk factors, not by directly killing cancer cells.

  • The strongest cancer prevention still includes:

    • Not smoking

    • Healthy diet

    • Regular physical activity

    • Screening and medical care

Nature helps prevent cancer by lowering chronic stress and inflammation, strengthening immune surveillance, improving sleep and activity levels, and reducing exposure to harmful environmental and behavioral risks.

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Mary Grenchus