Vegetarian and Vegan Diets Linked to Cancer Risks and Benefits

Recent research suggests a complex relationship between vegetarian and vegan diets and cancer risk. Whereas plant-based diets are associated with a lower risk of several cancers, they may also increase the risk of others. Understanding these nuances is crucial for making informed dietary choices.

Cancer Risk Reduction with Plant-Based Diets

A study funded by the World Cancer Research Fund indicates that vegetarians have a reduced risk of certain cancers compared to meat eaters. Specifically, the research shows:

• 21% lower risk of pancreatic cancer
• 12% lower risk of prostate cancer
• 9% lower risk of breast cancer
• 28% lower risk of kidney cancer
• 31% lower risk of multiple myeloma

Increased Cancer Risks in Vegetarians and Vegans

Though, the research also reveals potential increased risks associated with plant-based diets. Vegetarians have almost twice the risk of squamous cell carcinoma, the most common form of esophageal cancer. Vegans exhibit a 40% higher risk of colon cancer compared to meat eaters.

The Changing Profile of Vegetarians

Ellen Kampman, professor of nutrition and disease at Wageningen University, notes that the observed effects may be influenced by the historical context of the studies. In the 1990s and early 2000s, vegetarians tended to be a more health-conscious group—highly educated, physically active, and with generally healthier lifestyles. This makes it challenging to directly apply the findings to modern vegetarian and vegan populations.

Navigating Vegetarian and Vegan Nutrition

Kampman emphasizes that it remains difficult to definitively state whether a completely vegetarian or vegan diet is healthier overall. Current dietary guidelines recommend reducing meat and dairy consumption rather than complete elimination. For those choosing a vegan lifestyle, careful attention to nutrient intake is essential to avoid deficiencies.

Dietary Recommendations from Experts

Kampman advises reducing red meat and avoiding processed meats. Increasing consumption of poultry and fish (once a week) is also recommended. Vegetarians and vegans are encouraged to prioritize a diet rich in vegetables, fruits, legumes, nuts, and dietary fiber, as these foods are associated with numerous health benefits, including weight management—a known factor in cancer prevention.

Expert Insights: Ellen Kampman

Ellen Kampman is a nutritional epidemiologist and Chair in Nutrition and Disease at Wageningen University in the Netherlands. Her research focuses on the role of lifestyle in cancer prevention and prognosis, conducting observational and intervention studies in various countries. Learn more about her perform at Wageningen University. She has published over 200 peer-reviewed papers and supervised more than 30 PhD students. Further information can be found at the Institute 4 Preventive Health.

Key Takeaways

• Vegetarian and vegan diets are linked to both reduced and increased risks of specific cancers.
• The health profile of vegetarians has evolved, potentially impacting research findings.
• A balanced plant-based diet, with attention to nutrient intake, is crucial for optimal health.
• Reducing red and processed meat consumption is generally recommended.