Broccoli is a very nutritious vegetable being high in vitamin C, vitamin K, vitamin A, riboflavin, calcium, iron, and soluble fiber.
The compound sulforaphane has been identified in broccoli, which, of the cruciferous vegetables, has the highest concentration of sulforaphane. This compound is best known for its anti-cancer benefits. Boiling broccoli significantly reduces the level of sulforaphane from 20-30% after 5 minutes to 77% after 30 minutes. However, steaming, microwaving, and stir-frying has no significant effect.
 
Many research studies have determined that cancer is related to three metabolic problems within the body. These three problems are (1) chronic inflammation (2) oxidative stress, and (3) inadequate detoxification. It is believed that broccoli can assist all three of these problems as it is rich in anti-inflammatory nutrients, antioxidant nutrients, detox-support nutrients, and anti-cancer nutrients.
 
Because of broccoli's rich source of the phytonutrient kaempferol, it can help lower the risk of chronic inflammation. Broccoli has a strong, positive impact on our body's detoxification system due to three glucosinolate phytonutrients found in the vegetable. Antioxidants in broccoli lower risk of oxidative stress in the body, such as muscle and tissue damage, diabetes, and heart disease.
Of all the common cruciferous vegetables, broccoli has the most concentrated source of vitamin C, helping immune system deficiencies. The dietary fiber in broccoli helps prevent bacterial overgrowth to the stomach wall and regulates the speed and consistency that food travels through our intestines.
Lutein and zeaxanthin, two carotenoids, found to be in significant concentration in broccoli, play a vital role in eye health. B-complex vitamin deficiency poses a risk for cardiovascular health such as stroke and heart attacks. Broccoli is a rich source of B-complex vitamins, namely B6 and folate. It also has a cholesterol lowering ability which supports cardiovascular health.
 
Whilst broccoli does not have any Vitamin D, it is an excellent source of Vitamin K and Vitamin A. Research indicates that when Vitamin D supplements are required to offset a deficiency, sufficient sources of Vitamin K and Vitamin A together (in broccoli), can keep the Vitamin D metabolism in proper balance.