I have a relative who's in the medical field, and when I told him about this, he told me that my body is probably just absorbing the magnesium too quickly. But then again, that may just be because of the type of tablets I was taking http://www.bulkpowders.co.uk/magnesium-bisglycinate-tablets.html. But I probably don't have too much magnesium in my diet. I had a blood test showing normal levels of trace elements and all that jazz.