Narrator: This is Science Today. Brassica plants are the richest and most diverse source of vitamins of any vegetable. These antioxidant-rich vegetables include broccoli, bok choy, Brussels sprouts, kale and cauliflower. Nutritional scientist Leonard Bjeldanes of the University of California, Berkeley is studying this family of vegetables as protective and potentially therapeutic agents for certain cancers.
Bjeldanes: We had been studying for some time the effects of the vegetables on mammary and breast cancer and there's a fair amount of information that says indeed, they are in fact protective of mammary and breast cancer. Epidemiology shows that, animal studies show that, and so on.
Narrator: Bjeldanes then discovered that Brassica plants have a similar protective effect in the prostate, too.
Bjeldanes: The thing that is interesting about these food components that intrigues me and others that's separate from the drug aspect, is that these are naturally occurring substances that people have been consuming for millennia and we don't have any indications of toxicity.
Narrator: For Science Today, I'm Larissa Branin.