**7. In food and nutrition**

Magnesium is the fourth most abundant metal ion, showing important physiological functions in the human body. Magnesium balance is maintained by renal regulation of magnesium reabsorption. According to the United States Food and Nutrition Board recommended daily allowance for magnesium is 420 mg for adult males and 320 mg for adult females, respectively. Green vegetables, nuts, seeds, and unprocessed cereals are rich sources of magnesium; besides, some magnesium is made available in fruits, fish, meat, and milk products. However, consumption of processed foods, demineralized water, and agricultural practices using soil deficient in magnesium for growing food, lowers the consumption levels than the recommended amounts, resulting in magnesium deficiency leading to hypomagnesemia, cardiac or neurological disorders [28].
