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Related Experiment Videos

Diet and cancer.

W C Willett1

  • 1Departments of Epidemiology and Nutrition, Harvard School of Public Health, Boston, Massachusetts 02115, USA.

The Oncologist
|October 21, 2000
PubMed
Summary
This summary is machine-generated.

Lifestyle factors like positive energy balance and physical inactivity significantly influence common cancer risks in Western countries. Folic acid intake may reduce colon and breast cancer risks, especially for alcohol consumers.

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Area of Science:

  • Oncology
  • Nutritional Science
  • Epidemiology

Background:

  • Cancer rates vary significantly globally and with migration, suggesting environmental and lifestyle influences.
  • Dietary fat was hypothesized as a key factor, but evidence is inconclusive.
  • Positive energy balance and physical inactivity are increasingly recognized as significant risk factors.

Purpose of the Study:

  • To evaluate the role of lifestyle and environmental factors in common Western cancers.
  • To investigate the impact of diet, physical activity, and specific nutrients on cancer risk.
  • To clarify the relationship between energy balance, physical activity, and cancer incidence.

Main Methods:

  • Analysis of large prospective studies and case-control studies.

Related Experiment Videos

  • Examination of correlations between national dietary consumption and international cancer rate differences.
  • Investigation of specific dietary components like fat, red meat, fruits, vegetables, and folic acid.
  • Assessment of physical activity, energy balance indicators (age at menarche, adult weight gain), and genetic polymorphisms.

    • Main Results:

    • Dietary fat intake is not strongly correlated with cancer risk.
    • Positive energy balance and physical inactivity are linked to increased breast and colon cancer risks.
    • Higher folic acid consumption shows a potential benefit for reducing colon and breast cancer risks, particularly in alcohol consumers.
    • The role of fruits and vegetables may be less significant than previously thought, except for folic acid content.

    Conclusions:

    • Lifestyle factors, particularly energy balance and physical activity, are critical determinants of common cancers.
    • Folic acid emerges as a potentially protective nutrient against colon and breast cancers.
    • Further research is needed to clarify the complex interplay of diet and other factors in cancer etiology.