Pelvic inflammatory disease (PID) is a common gynecological infection that results in a considerable number of sick days and costs society a lot of money. In severe cases, the condition may lead to chronic pain and even sterility if it is not treated in time. There are different things that can cause the infection, and the diet plays key role in supporting the immune defense. Here, magnesium deficiency, which is quite common, appears to increase the risk, especially among older women, according to a study that is published in Frontiers in Nutrition.