I have a friend with a Hx of Kidney stones x 6yrs and drinks cola almost 24/7 and occassionally green tea and water when doesn t have the cola. He has a poor diet and labs have been WNL ( least thats what he says) very concerned for him. Had him on a green tea ans water regiment for a month and did very well... no stones and alot of energy. I m very concerned about him. I believe the phosphoric acid and poor diet are major roles in the stones and he has stopped listening to me about the cola diet and how unhealthy it is. Should i call his urologist and explain about the diet and cola abuse? this wouldn t be the first time I ve called the doctor on him.