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Modifiable risk factors for colon cancer
1Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Department of Nutrition, Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA. edward.giovannucci@channing.harvard.edu
Gastroenterology Clinics of North America
|December 20, 2002
Summary
Colon cancer risk is significantly influenced by diet and lifestyle. Modifiable factors like physical activity, weight, and diet can prevent over 70% of colon cancers, offering broader health benefits.
Area of Science:
- Oncology
- Nutritional Science
- Epidemiology
Background:
- Colon cancer incidence is high, particularly in Western countries, with numerous dietary and lifestyle factors implicated.
- Physical inactivity, excess body weight, central adiposity, and energy overconsumption are established risk factors.
- Mechanisms linking diet and lifestyle to colon cancer are complex and not fully understood, involving factors like insulin and IGF-1.
Purpose of the Study:
- To review the current evidence on dietary and lifestyle factors influencing colon cancer risk.
- To identify key modifiable risk factors for primary prevention strategies.
- To discuss the role of specific nutrients, macronutrients, and lifestyle choices in colon cancer development.
Main Methods:
- Review of existing epidemiological studies and scientific literature.
- Analysis of evidence linking specific dietary components (e.g., red meat, refined carbohydrates, alcohol, folate) and lifestyle factors (e.g., physical activity, obesity, smoking) to colon cancer risk.
- Evaluation of potential chemopreventive agents and their associated risks.
Main Results:
- Physical inactivity, excess body weight, and high energy intake are strongly associated with increased colon cancer risk.
- Red meat, processed meats, refined carbohydrates, and high alcohol consumption may contribute to risk, potentially via hyperinsulinemia.
- While fiber's direct role is debated, certain micronutrients and phytochemicals in fiber-rich foods, like folate, show promise.
- Smoking and low intake of certain micronutrients are also linked to higher risk.
Conclusions:
- Primary prevention of colon cancer is feasible, with an estimated 70% of cases potentially preventable through moderate diet and lifestyle modifications.
- Addressing modifiable risk factors for colon cancer offers co-benefits for cardiovascular disease and other cancers.
- Secondary prevention through screening remains crucial for reducing colon cancer mortality.
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