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According to a 2021 study through the National Kidney Foundation, caffeine, whether in tea, soda, coffee, or alcohol, is protective and may decrease the risk of kidney stones....
Earlier investigations have shown that habitual coffee and caffeine consumption is associated with reduced risk of kidney stones, but this is the first study that employs genetic variants in the randomized review. Over half a million people go to emergency rooms for kidney stone problems every year.
Caffeine causes a short but sudden increase in blood pressure. Research has not shown that drinking 3-4 cups of coffee a day increases the risk of kidney disease or increases rate of decline of kidney function. However, moderating how much coffee you drink is a good idea.
Numerous studies have concluded that coffee is unlikely to harm the kidneys or cause chronic kidney disease (CKD). In fact, research has identified several benefits to consuming a moderate amount of coffee. The caffeine in coffee can improve energy levels and metabolism to aid in fat burning.
Some studies suggest excess coffee or caffeine consumption may negatively affect kidney function or health. Other research indicates that appropriate coffee consumption may be safe or potentially benefit kidney health.
Caffeine sources also affected the association between caffeine intake and the risk of kidney stones. The ORs (95% CIs) of the risk of kidney stones for quartile 4 vs. quartile 1 were 0.7706 (0.7692, 0.7721) for caffeine from coffee and 1.0431 (1.0404, 1.0457) for caffeine from noncoffee sources.
The findings showed that not all types of beverages affect kidney stone disease. Only caffeinated coffee and decaffeinated coffee and tea, but not caffeinated and noncaffeinated sodas, are associated with an ∼10% lower risk of kidney stone incidence (38).
Caffeine exerts diuretic properties by adenosine receptors in the kidney. 26 Adequately compensated by water intake, the caffeine contained in coffee beverages results in an increase in urine flow, which represents an important protective factor against the development of kidney stones.
Caffeine intake has been shown to be associated with increased urinary calcium excretion and, as such, could potentially increase the risk of developing kidney stones, although in our previous reports we consistently found an inverse association between consumption of caffeine-containing beverages, such as coffee and tea, and the risk of ...
Limitations: Genetic influence on kidney stone risk via pathways not involving coffee or caffeine. Conclusions: Using genetic data, this study provides evidence that higher coffee and caffeine consumption may cause a reduction in kidney stones.