问答题 Anyone who has ever had a kidney stone knows that trying to get rid of it can be one of life"s more uncomfortable experiences. So if you"re prone to having kidney stones, it"s wise to do what you can to prevent them. And lemonade, or just lemon juice, turns out to be one of the better ways. Lemons are full of citrate—a chemical that attached to calcium in the kidney and stops it from forming crystals that can turn into stones. If you want to prevent kidney stones but aren"t partial to sugary lemonade, drinking just plain lemon juice mixed with water works as well. And if you don"t like lemons at all, then try drinking lots of fluids and eating less salt, calcium, and protein.