Current epidemiological, genetic, and experimental evidence refutes the claim that excessive tea consumption increases the risk of kidney stones, instead indicating that regular or heavy tea intake is associated with a reduced risk of nephrolithiasis.
The retrieved literature contains no papers supporting the claim that excessive tea consumption increases kidney stone risk. Conversely, multiple rigorous studies—including a large prospective cohort study combined with Mendelian randomization [11], population-based genetic analyses [8], and clinical case-control studies [6]—consistently demonstrate a protective inverse relationship between tea consumption and kidney stone formation. Therefore, the claim is refuted by the available evidence.