Cruciferous vegetables (such as broccoli, cauliflower, brussels sprouts and cabbage) have shown to be preventative of cervical, thyroid, colon, prostate, breast and other cancers. These vegetables fight cancer due to chemicals known as glucosinolates.

Compounds in broccoli are rich in nutrients such as minerals, potassium, magnesium and manganese. These same compounds support the body’s ability to detoxify. They also interrupt the ability of cancer cells to reproduce, thus stopping them in their tracks.

http://www.lef.org/magazine/mag2007/jun2007_sf_broccoli_01.html