What if it were fruit or vegetables?
D015179:Colorectal Neoplasms / Q000517:prevention & control*; D005492:Folic Acid / Q000008:administration & dosage; D005638:Fruit; D006801:Humans; D007417:Intestinal Polyps / Q000517:prevention & control*; D014675:Vegetables
D005492:Folic Acid