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.
Taking a good quality B-complex supplement (supplying at least 25 mg of the major B vitamins) along with additional zinc (15 â 30 mg) and magnesium (300 â 500 mg) each day may go some way to providing a nutritional safety net for those seeking to let go of their drinking habit.