Diets high in cruciferous vegetables appear to be linked with a lower risk of certain types of cancer. A population-based study found that those who ate diets high in lutein, a vitamin A–like chemical obtained from vegetables such as broccoli, spinach, and lettuce, had fewer cases of colon cancer. A similar study suggested that those who ate cruciferous vegetables seemed to have a lower risk for bladder cancer, but a similar study of smokers found no such benefit. Recent studies suggest that the