Yoga exercises could stimulate the passage of (green) food and/or (originally green) bile through your bowel, and then either the food or bile would color the stool green. If stools are loose and contain undigested food, you are losing nutrients this way.
Excessive use of magnesium supplements can be toxic. The upper limit -- the highest dose a person can take -- of magnesium supplements is: 65 mg/day for children ages 1-3. 110 mg/day for children ages 4-8. 350 mg/day for adults and children ages 9 and up.
Women trying to prevent or treat osteoporosis typically take 1,000-1,500 mg of calcium a day in the form of supplements. Researchers found this amount of calcium can bind up to 500 mg of phosphorus -- making it unavailable to the body.