Does Beer Clean Your Kidneys? A Medical Look at a Popular Myth

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Beer does not clean your kidneys. Studies that followed thousands of people for years link moderate drinking with fewer kidney stones, which is very different from dissolving stones or improving kidney function.

The belief rests on an everyday observation, because people who drink beer urinate more. From there, it is a short step to thinking the kidneys are “getting washed out”.

The data tell a more nuanced story. In moderate amounts beer is barely diuretic, the benefit against stones comes from observational studies, and heavy drinking does damage the kidneys.

Why do people say beer cleans the kidneys?

The myth blends two ideas that are each true on their own. Drinking more fluid lowers the risk of kidney stones. Beer is mostly water.

The leap lies in assuming that urinating more means “cleaning”. The kidneys filter the blood continuously and do not build up dirt that a drink could flush away.

So the useful question is not whether beer cleans anything, but how it relates to kidney stones and to kidney function.

Is beer a diuretic?

Much less than people think. In a randomized trial in older men, 30 g of alcohol in the form of beer produced no more urine than the same volume of non-alcoholic beer, whereas wine and spirits did cause a brief, small diuretic effect (Polhuis et al., 2017).

How alcohol affects urine output also depends on how well hydrated you are to begin with.

After a liter of 4% beer, well-hydrated volunteers urinated more than with the non-alcoholic version. In dehydrated volunteers the difference was not significant (Hobson and Maughan, 2010).

The urge to urinate after a few beers comes mainly from the volume you drink. The hormonal mechanism behind alcohol is covered in how beer triggers diuresis.

What do studies say about beer and kidney stones?

Three large cohorts found fewer stones among beer drinkers. The most cited figure comes from 27,001 Finnish smokers, in whom each daily bottle was associated with a relative risk of 0.60 (Hirvonen et al., 1999).

A relative risk of 0.60 means 40% fewer cases compared with those who did not drink that bottle.

[math]\text{Reduction} = (1 – 0.60) \times 100[/math]

[math]\text{Reduction} = 40\,\%[/math]

None of these studies proves that beer causes the protection.

They are observational studies based on questionnaires. The authors adjusted for other factors without being able to rule them all out.

The most likely explanation is the fluid intake. Curhan and Ferraro also found fewer stones with coffee, tea and wine, which points to the volume of water rather than a property unique to beer.

A more recent cross-sectional analysis of US adults (NHANES 2007 to 2018) also found a lower history of stones in some groups of drinkers (Wei et al., 2024). That design measures everything at a single point in time, so it cannot show which came first.

The table summarizes the three prospective studies. The figures refer to beer within each analysis.

Is beer bad for your kidneys?

It depends on how much you drink.

Among 11,023 male US physicians followed for 14 years, having seven or more drinks a week was not associated with worse kidney function (Schaeffner et al., 2005). The risk was even slightly lower than among those who had one drink a week or less.

The problem appears with heavy drinking. In Australia, consuming 30 g of alcohol or more a day, between two and three 330 ml beers depending on their strength, was associated with more albuminuria, the loss of protein in the urine that often signals kidney damage (White et al., 2009).

The National Kidney Foundation warns that regular heavy drinking doubles the risk of kidney disease. It also notes that binge drinking can cause acute kidney injury severe enough to require dialysis.

Excess alcohol also raises blood pressure and damages the liver, two problems that end up affecting the kidneys.

Why can beer promote another type of kidney stone?

Beer is the alcoholic drink most strongly associated with gout. Among 47,150 men followed for 12 years, each daily beer was associated with a 49% higher risk of gout (Choi et al., 2004).

Excess uric acid can also form uric acid stones. Anyone who has had them before or has gout should not see beer as protection. The mechanism is explained in the link between beer and uric acid.

Does drinking beer help during renal colic?

There is no evidence that drinking large amounts of fluid helps pass the stone during an attack. A Cochrane review found no reliable evidence in favor of forced hydration or diuretics in acute ureteric colic (Worster and Bhanich Supapol, 2012).

The European Association of Urology guidelines treat renal colic as an emergency that calls for immediate pain control (Türk et al., 2016). Waiting for a few beers to sort it out only delays seeing a doctor.

Nor are there any studies on the warm beer remedy. None of the studies cited assessed the temperature of the drink.

Who should check with a doctor before drinking beer?

People with chronic kidney disease, on dialysis or with a kidney transplant should ask their nephrologist. In these cases fluids, certain minerals and the interaction of alcohol with medications are all monitored.

The National Kidney Foundation recommends always seeking advice if you have a condition or treatment that alcohol could affect. For anyone who wants to cut back, there are science-backed strategies to stop drinking beer.

For everyone else, the most reliable way to look after your kidneys is still to drink enough water, keep your blood pressure in check and not go beyond moderate drinking.

Frequently asked questions (FAQ)

1. Is beer good for your kidneys?

It cannot be called good. Studies link moderate drinking with fewer kidney stones, probably because of the fluid it provides, while heavy drinking is associated with kidney damage.

2. Does beer help pass kidney stones?

There is no evidence that it does. A Cochrane review found no reliable evidence that forcing fluid intake helps pass a stone during an attack of colic. Renal colic needs medical attention.

3. Is non-alcoholic beer good for your kidneys?

It provides fluid without the effect of alcohol. In one trial it produced the same amount of urine as regular beer. It has no special properties for the kidneys, and in advanced kidney disease it also counts toward fluid limits.

4. Can someone with kidney failure or a kidney transplant drink beer?

That is a decision to make with their nephrologist. In kidney disease and after a transplant, fluids and the interaction of alcohol with medications are monitored.

5. Is warm beer good for your kidneys?

There are no studies to support it. Research on beer and kidney stones did not assess temperature, and none shows a therapeutic effect.

References

1. Choi, H. K., Atkinson, K., Karlson, E. W., Willett, W., & Curhan, G. (2004). Alcohol intake and risk of incident gout in men: a prospective study. The Lancet, 363(9417), 1277–1281. https://doi.org/10.1016/S0140-6736(04)16000-5
2. Curhan, G. C., Willett, W. C., Rimm, E. B., Spiegelman, D., & Stampfer, M. J. (1996). Prospective study of beverage use and the risk of kidney stones. American Journal of Epidemiology, 143(3), 240–247. https://doi.org/10.1093/oxfordjournals.aje.a008734
3. Ferraro, P. M., Taylor, E. N., Gambaro, G., & Curhan, G. C. (2013). Soda and other beverages and the risk of kidney stones. Clinical Journal of the American Society of Nephrology, 8(8), 1389–1395. https://doi.org/10.2215/CJN.11661112
4. Hirvonen, T., Pietinen, P., Virtanen, M., Albanes, D., & Virtamo, J. (1999). Nutrient intake and use of beverages and the risk of kidney stones among male smokers. American Journal of Epidemiology, 150(2), 187–194. https://doi.org/10.1093/oxfordjournals.aje.a009979
5. Hobson, R. M., & Maughan, R. J. (2010). Hydration status and the diuretic action of a small dose of alcohol. Alcohol and Alcoholism, 45(4), 366–373. https://doi.org/10.1093/alcalc/agq029
6. National Kidney Foundation. (n.d.). Alcohol and your kidneys. https://www.kidney.org/kidney-topics/alcohol-and-your-kidneys
7. Polhuis, K. C. M. M., Wijnen, A. H. C., Sierksma, A., Calame, W., & Tieland, M. (2017). The diuretic action of weak and strong alcoholic beverages in elderly men: a randomized diet-controlled crossover trial. Nutrients, 9(7), 660. https://doi.org/10.3390/nu9070660
8. Schaeffner, E. S., Kurth, T., de Jong, P. E., Glynn, R. J., Buring, J. E., & Gaziano, J. M. (2005). Alcohol consumption and the risk of renal dysfunction in apparently healthy men. Archives of Internal Medicine, 165(9), 1048–1053. https://doi.org/10.1001/archinte.165.9.1048
9. Türk, C., Petřík, A., Sarica, K., Seitz, C., Skolarikos, A., Straub, M., & Knoll, T. (2016). EAU guidelines on diagnosis and conservative management of urolithiasis. European Urology, 69(3), 468–474. https://doi.org/10.1016/j.eururo.2015.07.040
10. Wei, B., Tan, W., He, S., Yang, S., Gu, C., & Wang, S. (2024). Association between drinking status and risk of kidney stones among United States adults: NHANES 2007–2018. BMC Public Health, 24, 820. https://doi.org/10.1186/s12889-024-18307-1
11. White, S. L., Polkinghorne, K. R., Cass, A., Shaw, J. E., Atkins, R. C., & Chadban, S. J. (2009). Alcohol consumption and 5-year onset of chronic kidney disease: the AusDiab study. Nephrology Dialysis Transplantation, 24(8), 2464–2472. https://doi.org/10.1093/ndt/gfp114
12. Worster, A. S., & Bhanich Supapol, W. (2012). Fluids and diuretics for acute ureteric colic. Cochrane Database of Systematic Reviews, 2, CD004926. https://doi.org/10.1002/14651858.CD004926.pub3

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