people who eat an abundance of broccoli have fewer cancers of the colon, breast, cervix, lungs, prostate, esophagus, larynx, and bladder. Broccoli contains indoles, which can help inactivate harmful estrogens that can promote the growth of tumors, sulforaphane, which stimulates cells to produce cancer-fighting enzymes, and beta-carotene, another cancer fighter.
Broccoli also contains a class of potent anti-carcinogens (cancer-combating agents) called isothiocyanates. These compounds block many cancer-causing agents in a wide variety of cancers. But before deciding that isothiocyanates are a cure-all, it's useful to note that these sulfur compounds vary from one variety to another. For example, the SAGA-type contains an extraordinary source of isothiocyanates, while the Winchester variety has only a negligible supply. Odds are slim that the generic broccoli in your neighborhood store is a SAGA-type.
The most important indole in broccoli — indole-3-carbinol, or I3C — is thought to be an especially effective breast cancer prevention agent.
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