All living things, including people, need zinc in their diets. Getting too little of this essential metal can impair growth and cause immune dysfunction, neurological disorders and cancer.

Every living organism uses tiny quantities of metals to carry out biological functions, including breathing, transcribing DNA, turning food into energy, or any number of essential life processes.

Did you know? On average, sleep makes up one-fourth to one-third of your life. But what is sleep? Why is it so important? Before the 1950s, many believed that sleep was a state where the brain and ...