Magnesium is a basic mineral and electrolyte that plays mainly in various bodily functions. Magnesium is a key to nerve and muscle function. To stay healthy, it is vital that people are getting enough calories in their diet each day. Magnesium deficiency may impede bone formation in younger people. Symptoms of magnesium deficiency include nausea and vomiting, appetite loss, exhaustion, and weakness. We also cover diagnosis, recommended dietary allowance (RDA), foods to eat, tips for increasing absorption, and magnesium supplements. We take a look at why people need magnesium, what it means, and what the key signs of deficiency are in this article.