The mineral magnesium provides many functions within the body, and one of them is to help keep bones strong (50 percent of body magnesium is found in bone). Eating a variety of foods can help to ensure adequate magnesium intake. Women over 30 should aim for 320mg of magnesium daily, while men need 400 to 420mg. These numbers are easy to obtain from a variety of legumes, nuts, whole grains, and dark leafy vegetables (spinach and quinoa are especially good sources). Read on for a couple of our favorite magnesium-rich snacks.