Hi, I hadn't heard that yeast feeds on magnesium, I heard that yeast depletes magnesium. I had been taking magnesium for awhile now and ran out. It was a couple of days before I got out to get more and in those couple of days, I became more anxious and my wrists began to hurt. As soon as I got back on the magnesium, calmness came over me and my wrists stopped hurting. I know that magnesium is helping me in my battle with yeast.