Though it may not be as well known as other essential minerals like potassium and calcium, magnesium is absolutely crucial for healthy body functioning. Unfortunately, experts estimate that about 80% of adults are deficient in this vital mineral. Those who consume less than their recommended amount of magnesium are likely to have elevated inflammation in the body, which can put you at risk for cancer, diabetes, heart disease, and other health conditions. Deficiency is also associated with osteoporosis.