Mushrooms are a good source of iron. Mushrooms are very effective in preventing breast and prostate cancer due to the presens of beta glucans and conjugated linoleic acid, which both have anti-carcinogenic effects. Mushrooms are an ideal low-energy diet for diabetics. Mushrooms are a rich source of calcium, which is an essential nutrient in the formation and strength of bones. The good combination of vitamins a, vitamin b-complex and vitamin c that is found in them also strengthens the immune system.