A study published in the Journal of Nutrition (2005; 135(10):2468–2472) examined dietary patterns in relation to colorectal adenoma risk. The researchers compared 362 patients diagnosed with colorectal adenomas to 427 healthy control subjects without adenomas.
Dietary intake was assessed for multiple nutrients. The analysis found inverse relationships between intake of folic acid, vitamin B6, and vitamin C and the risk of colorectal adenoma. Higher intakes of these nutrients were associated with a lower likelihood of adenoma presence.
Vitamin D and beta-carotene intake were also inversely associated with adenoma risk. However, the apparent benefit of beta carotene was limited to non-smokers. Among smokers, beta-carotene intake did not show the same association with reduced adenoma risk.
These findings suggest that overall dietary nutrient patterns—particularly those rich in certain vitamins—may be linked with colorectal adenoma risk, while lifestyle factors such as smoking can modify these relationships.
