What causes kidney stones?
What causes kidney stones?
user
Kidney stones are caused by excess crystals of either calcium or phosphate, which build up in your kidneys.  These stones can get large enough to cause kidney damage.  The best way to prevent kidney stones is to drink plenty of fluids.  Dehydration can also cause crystals to form in the kidneys.
assistant
So drinking a lot is the best. Should you drink water or is anything fine?
user
Water is good. The darker the drink, the more fluids it contains. Red wine also contains a lot of water, so it’s a good choice too.  But avoid beverages that contain caffeine or citric acid, as these can irritate your kidneys.
assistant
So a lot of red wine?
user