Veggies Against Colon Cancer Colon cancer is the second leading cause of cancer death in the world. Diet is a key factor that is in your control. This meta-analysis of 17 studies of 639,539 people found that people who eat the most cruciferous vegetables are a significant 17% less likely to get colon cancer. Significant benefit begins at 20g a day. At an optimal 40- 60g a day, the benefits rises to a 26% reduction in risk. BMC Gastroenterology. 2025;25,575. To