A high fluid intake is one of the most important cornerstones of kidney stone dietary prevention. A sufficiently dilute urine will prevent the individual chemical components of stones from becoming concentrated enough to precipitate out of solution. Until this study, the majority of patient advice leaflets discouraged the use of cola to increase fluid intake. Indeed, the NIDDK website specifically states "Grapefruit juice and dark colas have been found to increase the risk of stone formation and should be avoided by people who are prone to calcium oxalate stone formation."This small study has shown that cola exerts no detectable change in urinary risk factors associated with the commonest type of stone. In some cases, it may make life easier for that cohort of our patients who prefer cola drinks.
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