Broccoli is a cruciferous vegetable, part of the same family as cabbage, cauliflower, and brussel sprouts. It has cancer fighting compounds like sulforaphane and indole-3-carbinol. Broccoli is also beneficial for the immune system, with anti-viral and anti-bacterial activity. It's effective against the bacteria that causes stomach ulcers. And it's been shown to help prevent heart disease.
Broccoli is easy to prepare, just steam it for 4-5 minutes. Add a squeeze of fresh lemon, and some ripe avocado for a special treat. Or saute it in some olive oil and garlic. Add a splash of water for the last minute of cooking to steam it slightly. Broccoli sprouts are also good for you.
Populations that eat the most fresh fruits and vegetables have the lowest rates of cancer, heart disease, and diabetes.