Eat your Broccoli raw. Although some vegetables are more appropriate eaten cooked, it appears that an active anti-cancer substance in broccoli, called sulforaphane, is destroyed when this vegetable is cooked. Researchers in The Netherlands asked eight men to eat 200 grams of crushed broccoli, raw or cooked, with a warm meal. Higher amounts of sulforaphane were found in the blood and urine when broccoli was eaten raw (bioavailability of 37%) versus cooked (3%). See