This disease-fighter has been a linked to decreased risks for skin, lung and stomach cancers, which will kill more than 100,000 men this year. The mineral works closely with vitamin E to protect cells from damage by oxygen – containing molecules called free radicals.

The Recommended Dietary Allowance of selenium for men is a minuscule 70 micrograms per day, but even moderately low levels can cause anxiety and feelings of tiredness. Good sources include grains, fish and vegetables such as broccoli, cucumbers, onions, garlic, radishes and mushrooms.