Dr. Sherry Rogers wrote books that a lack of magnesium causes heart arrhythmia. I have never fasted but I have read that people need to enema to clear toxins. You should look into Living Clay Co. and the book by Perry A-. This clay can be taken internally. After a month of consuming 1 TBSP a day, when I sweat, I get ring around the collar on my back and chest. The dirt needs to be rubbed off. The dirt that comes out is from inside. To buy in bulk, power mall at power hour nation dot com is a good source.