How do cruciferous vegetables prevent cancer?

Cruciferous vegetables like broccoli, Brussels sprouts, cabbage, and cauliflower have a chemical in them that prevents cancer. It's unclear whether they decrease cancer rates by turning on your immune system, having a cancer-fighting agent, or just attacking the cancer or the need for cancer cells to have specialized nutrients. But it might be linked to two compounds found in these vegetables (for you pre-meds or ER junkies, they're indole-3 carbinol and sulforaphane).

Whatever the mechanism, studies of patients with bladder cancer and gut cancers make it likely that those eating seven or more non-fried servings (fistfuls) of cruciferous vegetables a week can prevent the growth of cancer by 50 percent.

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