Diet soda does not appear to raise uric acid levels or significantly increase gout risk. A large prospective study following over 46,000 men for 12 years found no association between diet soft drink consumption and incident gout, with the statistical trend being essentially zero. This stands in sharp contrast to sugar-sweetened sodas, which are a well-established gout trigger. That said, the picture isn’t perfectly clean, and the details matter if you’re managing gout or trying to prevent flares.
Why Regular Soda Triggers Gout
Understanding why regular soda is a problem helps explain why diet soda largely gets a pass. The culprit in regular soft drinks is fructose, typically delivered as high-fructose corn syrup. When your liver processes fructose, it kicks off an unregulated chain reaction: fructose gets converted to a compound that depletes your cells’ energy currency (ATP), which breaks down into a precursor that your body turns into uric acid. More uric acid in the blood means a higher chance of crystal formation in your joints.
Fructose also appears to interfere with how your kidneys flush uric acid out. A transporter protein in the kidneys handles both fructose and uric acid, so when fructose levels are high, the two essentially compete for the same exit route. The result is that less uric acid leaves your body through urine, compounding the problem of extra uric acid being produced in the first place. For some people, genetic variations in this transporter make them even more vulnerable to fructose-driven uric acid spikes.
What the Research Says About Diet Soda
Artificial sweeteners like aspartame, sucralose, and saccharin don’t go through the same metabolic pathway as fructose. They aren’t broken down in the liver the same way, so they don’t trigger that ATP depletion cascade. A study published in BMJ Open found that artificially sweetened soft drinks did not raise serum uric acid levels at all, and this held true regardless of genetic background. People with and without the key transporter gene variant showed the same result: no uric acid increase from diet drinks.
The large cohort studies back this up. In the Health Professionals Follow-Up Study, sugar-sweetened soft drinks showed a clear dose-response relationship with gout (more soda, more gout), but diet soft drinks showed no such pattern. A 2025 meta-analysis published in Frontiers in Nutrition, which pooled data across multiple studies, concluded that sugar-sweetened beverages are clearly associated with increased risks of both high uric acid and gout, particularly in men. For diet soda, the meta-analysis noted only a “slight risk” for gout, a far weaker signal than for sugary drinks or even fruit juice.
The Kidney Question
One area where diet soda deserves more scrutiny involves kidney health, which matters for gout because your kidneys are responsible for clearing roughly two-thirds of your body’s uric acid. A study in the Clinical Journal of the American Society of Nephrology found that drinking more than seven glasses of diet soda per week was associated with an 83% higher risk of developing end-stage kidney disease compared to drinking less than one glass per week. This association held even after researchers adjusted for uric acid levels, diabetes, blood pressure, and other factors.
The potential mechanisms aren’t fully understood. Sodas, both diet and regular, contain phosphorus additives that may stress the kidneys over time and increase dietary acid load. If heavy diet soda consumption were to impair kidney function over years, that could theoretically reduce your body’s ability to excrete uric acid efficiently. This doesn’t mean a couple of diet sodas a week will damage your kidneys, but it’s a reason to avoid treating diet soda as a limitless substitute for water.
Better Beverage Choices for Gout
Water is the single best drink for gout management. An internet-based crossover study found that drinking at least 1,920 mL of water (about eight cups) in the 24 hours before a potential flare was associated with a 46% reduction in recurrent gout attacks. This makes sense physiologically: your kidneys’ ability to excrete uric acid is directly proportional to urine flow. More water means more uric acid leaving your body.
Coffee is another option worth considering. Research has shown that coffee can lower serum uric acid levels and reduce gout risk, likely through compounds that improve how the body processes purines. Low-fat dairy products also help by promoting uric acid excretion and alkalizing urine, which makes uric acid more soluble and easier for your kidneys to filter. Vitamin C supplementation has shown similar uric acid-lowering effects in some studies.
If you enjoy diet soda and have gout, the evidence suggests moderate consumption is unlikely to trigger flares or raise your uric acid the way a regular soda would. But leaning on water, coffee, and dairy as your primary beverages gives you active benefits rather than just the absence of harm.