Ladies: Muscle twitching is a sign of magnesium deficiency. Are you craving chocolate? If so, chocolate has magnesium in it. Do you drink alot of caffeine? Caffeine reduces magnesium in your body. I had twitching right under my left eye and now I take a magnesium oxide supplement. Your body will know when it has enough magnesium because you'll end up with loose stools. Magnesium is also found in lots of green veggies and nuts. Eat up!!