Magnesium is a very important mineral and here in the U.S. most Americans are critically low in this mineral and don't even know it .
Magnesium is used by every organ in your body and the intake of sugar depletes it and we definitely have a sugar addiction here in the U.S.. A few of the many signs of magnesium deficiency are any heart issues, muscle cramps, headaches, fatigue, brain fog - the list goes on and on. Increasing your intake of Mg can protect you from developing diabetes and heart disease.
A deficiency in this mineral is linked to many diseases and cancer. Please have yours checked and include more magnesium rich foods in your diet.
There are many in depth articles out there about magnesium get educated. Here is a good one by Natural Health;
http://www.naturalhealth365.com/magnesium-deficiency-2222.html