Soda Consumption Kidney Stones Scientific Study Shocks
Soda and kidney stones: what the science says
The short answer is that regular soda-especially sugar-sweetened cola and other sweetened soft drinks-has been linked in scientific studies to a higher risk of kidney stones, while water remains the safest everyday choice for prevention. One large study found that people drinking at least one sugar-sweetened cola a day had about a 23% higher risk of kidney stones than those drinking less than one serving per week.
What the study found
The most-cited evidence comes from a prospective study published in 2013 that examined soda and other beverages in relation to stone risk. In that study, sugar-sweetened cola was associated with a 23% higher risk of kidney stones, and sugar-sweetened non-cola beverages were associated with a 33% higher risk. The study also reported that artificially sweetened non-cola drinks showed a smaller, borderline association, suggesting that not all "diet" drinks behave the same way in the data.
A later clinical summary reported the same core finding in plainer language: higher intake of sugar-sweetened soda and punch was associated with more kidney stones, while coffee, tea, beer, wine, and orange juice were associated with lower risk. That does not mean those drinks are "protective" in a universal sense, but it does show that beverage choice matters in stone epidemiology.
Why soda may matter
Researchers point to a few plausible mechanisms behind the stone risk signal. Sugary drinks can raise fructose intake, and fructose may increase urinary calcium, uric acid, and oxalate handling in ways that favor stone formation. Cola drinks also often contain phosphoric acid, which may contribute to a more stone-friendly urinary environment.
Hydration is another major factor. If soda replaces water, total fluid quality can worsen even when total fluid volume looks adequate, and low urine volume is one of the strongest known risk factors for stones. In practical terms, the issue is not only what is in the can, but also what the can displaces in the diet.
Risk by beverage type
| Beverage type | Association with kidney stone risk | Evidence snapshot |
|---|---|---|
| Sugar-sweetened cola | Higher risk | About 23% higher risk in one large prospective study |
| Sugar-sweetened non-cola soda | Higher risk | About 33% higher risk in one large prospective study |
| Artificially sweetened non-cola | Possible smaller risk increase | Borderline association in the same study |
| Water | Lower risk in practice | Preferred fluid for stone prevention because it increases urine volume |
| Coffee, tea, wine, beer, orange juice | Lower risk in the study | Observed inverse association in the 2013 analysis |
How strong is the evidence?
The evidence is consistent enough to take seriously, but it is still mostly observational rather than proof of direct causation. That means scientists can say soda consumption is associated with kidney stones, but they cannot fully prove soda alone caused the stones in every participant. Even so, the repeated pattern across studies has made sugary beverages a credible prevention target.
A 2020 review cited in a 2025 clinical article also concluded that high soda consumption increases stone risk compared with low soda consumption. More recent kidney-related research has extended concern beyond stones, with higher intake of sugar-sweetened and artificially sweetened drinks associated with chronic kidney disease in a large cohort analysis reported in late 2024. Those findings do not equal the same disease process, but they strengthen the case that frequent sweetened beverage intake is not kidney-friendly overall.
Who should pay attention
People who have already had a kidney stone should pay special attention because recurrence is common and prevention matters more after a first event. The same advice is especially relevant for people who drink soda daily, have a family history of stones, live in hot climates, or have diet patterns high in sodium and low in fluids.
Stone type also matters. Calcium oxalate stones are the most common, but uric acid stones can be influenced by urinary acidity, sugar intake, and metabolic factors in different ways. A single beverage usually does not determine stone type, but regular soda intake can worsen the broader risk profile.
What to do instead
- Replace one daily soda with water, sparkling water, or unsweetened tea.
- Check your urine color; pale yellow usually signals better hydration.
- Limit sugar-sweetened cola and fruit punch, especially if you have had stones before.
- Spread fluid intake through the day instead of drinking most of it at once.
- Ask a clinician about stone prevention if you have recurrent episodes.
For many people, the most effective change is simple: swap one soda habit for one water habit. That small shift can raise urine volume, reduce sugar exposure, and lower the odds of the crystal conditions that allow stones to form.
Historical context
The beverage-stone connection entered public discussion after the 2013 publication of the major soda analysis, which brought attention to sugar-sweetened cola and punch. By 2020, clinical reporting was still highlighting the same message, suggesting the finding had held up well enough to remain relevant in routine counseling. By 2025, patient education pieces were still citing the same risk pattern while adding more detail about fructose, phosphoric acid, and hydration.
"Consumption of sugar-sweetened soda and punch is associated with a higher risk of stone formation," the study concluded.
Practical interpretation
The best scientific reading is not that soda inevitably causes kidney stones, but that frequent soda consumption-especially sugar-sweetened cola and sweetened non-cola drinks-raises the odds in a measurable way. If your goal is stone prevention, soda is a reasonable habit to reduce, and water is the clearest substitute.
That advice is especially compelling because it is low-cost, low-risk, and easy to act on. Even without perfect causal proof, the balance of evidence supports a simple public-health message: drinking less soda and more water is a smart kidney choice.
Frequently asked questions
Everything you need to know about Soda Consumption Kidney Stones Scientific Study Shocks
Does soda cause kidney stones?
Science shows an association, not absolute proof of causation, but the risk signal is strong enough that sugary soda is widely treated as a stone-promoting beverage.
Is diet soda safer for kidney stones?
Diet soda may be less concerning than sugar-sweetened soda, but one study still found a borderline risk signal for artificially sweetened non-cola drinks, so water remains the safest option.
Which drinks are better for prevention?
Water is the most reliable choice because it improves hydration and urine volume, which helps reduce stone formation risk.
Do all sodas raise the same risk?
No. The strongest associations in the study were seen with sugar-sweetened cola and sugar-sweetened non-cola drinks, while the relationship for artificially sweetened drinks was weaker.
Should someone with a history of stones avoid soda completely?
Complete avoidance is not always required, but reducing soda intake is a sensible prevention step for anyone with prior stones or repeated episodes.