Category talk:Kidney stones
I was passing small stones, between 2mm and 5mm in size, at least once a year. This went on for perhaps 20 years. Doctors told me to simply drink more water, but that did not stop the stones from forming. Finally, I took a photo of a stone and compared it to others on this site:
My stones seemed to most resemble calcium oxalate dihydrate stones shown there. Further research turned up info on low oxalate diets, so I tried avoiding foods high in oxalates, mostly chocolate, peanut butter, nuts, spinach, kale, and black tea. I previously ate all these foods, some daily, so I was probably getting more than my share of oxalates.
That was two years ago, and I have been free of stones since changing my diet. I still drink about 2 cups of coffee per day, and one cup of jasmine/green tea. I still have a small amount of chocolate occasionally, like when my wife makes brownies I allow myself one per day, but I try to eat some yogurt or take a calcium supplement with it to keep the oxalates from being absorbed.