Sweet potatoes are a good source of mag­nesium,

Sweet potatoes are a good source of mag­nesium, which is the relaxation and anti-stress mineral. Magnesium is necessary for healthy artery, blood, bone, heart, muscle, and nerve function, yet experts estimate that approximately 80 percent of the popula­tion in North America may be deficient in this important mineral.

Read more: http://www.care2.com/greenliving/9-reasons-to-love-sweet-potatoes.html#ixzz2nhkaNYtm