Involuntary spasms, especially in the legs, legs, legs or eyelids, is one of the first signs of magnesium deficiency. Magnesium is responsible for muscle contraction and weakening, balancing calcium levels, which stimulates muscle activity. When magnesium is low, the muscles can shrink uncontrollably, leading to painful seizures, plows or jolts. If you feel frequent, inexplicable muscle spasms, especially at night, you may need to check magnesium intake.