There are lots of foods (that I don’t eat much of) that have a high magnesium content. Green vegetables such as spinach are good sources of magnesium because the center of the chlorophyll molecule (which gives green vegetables their color) contains magnesium. Some legumes (beans and peas), nuts and seeds, and whole, unrefined grains are also good sources of magnesium.

Here is a link to a magnesium rich food chart: http://www.buzzle.com/articles/magnesium-rich-foods-chart.html

Hope it helps!