Magnesium is essential for the proper functioning of muscles, the maintenance of healthy nerves, and the formation of strong bones. Magnesium deficiency can result in muscle cramps, fatigue, problems sleeping, and irregular heartbeats. Magnesium also helps regulate blood sugar and cholesterol, which contributes to the management of diabetes and the prevention of osteoporosis. If you experience any of these symptoms, you should increase your magnesium intake by consuming more food or taking supplements.