Broccoli and other cruciferous vegetables, such as cabbage and cauliflower, contain a chemical called Sulforaphane. This chemical is belongs to family of anti-cancer chemicals made by many plants. This particular chemical has recently been shown to stop cancerous cells from dividing while having no such effect on normal cells. This chemical changes signals in the cell that regulate whether or not a gene is turned off and seems to stop cancer growth by turning anti-cancer genes back on. Sulforaphane is being tested for its anti-cancer properties in several clinical trials, but you don’t need to wait until the results are out to start eating more broccoli, cabbage, cauliflower, turnips and sprouts.