Zinc is a component of over 100 enzymes, some of which regulate metabolism and oxygen transport. Zinc also helps protect muscle and other tissue from damage due to free radicals. In one study,correcting a zinc deficiency led to an increase in muscle strength and endurance in middleaged women.
You’ll find this mineral in seafood, meats, whole grain products and fortified cereals. Diets high in protein provide substantial amounts of zinc.