Kidney stones are a familiar condition involving crystals forming within the kidneys, affecting some 12 percent of the global population. They have affected humans since at least 4,000 B.C., surfacing as the most common disease of the urinary tract. Recurring stone formation has been linked to a number of chronic diseases, including end-stage renal failure, heart disease, diabetes, and high blood pressure. Kidney stones have even been considered a systemic condition linked to metabolic syndrome. Stone formation is rather common, with an estimated five-year recurrence rate of up to 50 percent. Its prevalence has been on the rise in the past half-century, in part due to dietary and lifestyle changes. If you’re at risk for or have had kidney stones, you may be interested in exploring natural remedies. Here are some that are worth trying. 1. Water Studies have previously suggested that daily water intake that produces at least 2.5 liters …