Meat, dairy, and cancer

Area of Science:

• Oncology
• Nutritional Epidemiology
• Cancer Prevention

Background:

• The 2007 World Cancer Research Fund/American Institute for Cancer Research (WCRF/AICR) report established a convincing link between red and processed meat and colorectal cancer.
• The report also suggested milk may decrease colorectal cancer risk but increase prostate cancer risk, with limited evidence for other associations.
• Potential mechanisms linking meat to cancer include heterocyclic amines, polycyclic aromatic hydrocarbons, N-nitroso compounds, and heme iron.

Purpose of the Study:

• To review cohort studies by the National Cancer Institute on meat and dairy intake and cancer risk conducted since the 2007 WCRF/AICR report.
• To summarize findings from meta-analyses published after 2007 regarding meat, dairy, and cancer.
• To provide an updated perspective on the relationship between dietary animal products and various cancer types.

Main Methods:

• Review of cohort studies from the National Cancer Institute.
• Analysis of published meta-analyses since 2007.
• Synthesis of evidence on meat and dairy consumption in relation to cancer risk.

Main Results:

• The convincing evidence for red and processed meat and colorectal cancer remains.
• Updated evidence on the associations between meat, dairy, and other cancers is presented.
• Findings from recent meta-analyses are incorporated to strengthen the review.

Conclusions:

• The association between red and processed meat and colorectal cancer is strongly supported by updated evidence.
• The role of dairy products and other meats in cancer risk requires further investigation.
• Continued research is essential to clarify the complex relationship between diet and cancer prevention.