What dietary patterns are linked to a higher risk of colorectal polyps?

Colorectal polyps are growths in the colon that can sometimes turn into cancer. What you eat may affect your risk. Research shows that certain dietary patterns are clearly linked to a higher chance of developing these polyps. Diets heavy in red and processed meats, preserved vegetables, and refined carbs appear to increase risk, while diets rich in vegetables, fruits, and fiber are protective.

What the research says

A 2025 review of dietary patterns found that unhealthy diets rich in red and processed meats, refined carbohydrates, and fats are consistently associated with increased polyp occurrence and colorectal cancer risk ³. A 2026 meta-analysis of 31 studies confirmed that red meat intake raises the risk of colorectal polyps by 73% (RR 1.73) and processed meat by 65% (RR 1.65) ⁷. The same analysis noted that seafood intake was linked to lower risk ⁷. Another study from 2022 found that eating preserved vegetables (like pickled or fermented vegetables) was associated with an 18% higher odds of having colorectal polyps, especially small polyps and multiple polyps ⁶. In contrast, a 2020 systematic review reported that eating 3-5 servings of dried fruits per week was linked to a 24% lower risk of precancerous colorectal polyps ⁵. Overall, the evidence is strongest for observational studies, so while the links are clear, more research is needed to prove cause and effect ³.

What to ask your doctor

• Based on my personal risk factors, how much red and processed meat should I limit to reduce polyp risk?
• Are there specific dietary changes, like increasing fiber or following a Mediterranean diet, that you recommend for polyp prevention?
• Should I avoid preserved or pickled vegetables, or is occasional consumption okay?
• How often should I have a colonoscopy if I have a family history of polyps or colorectal cancer?
• Can you refer me to a dietitian who can help me plan a polyp-preventive diet?