Yellow onion and gout
Verdict: Yellow onion is low in purines — you can eat it regularly as part of a gout-friendly diet.
Yellow onions are a kitchen staple that you can feel confident including in your diet when managing gout. At 9.4 mg of purines per 100 g, they fall into the low-purine category, meaning they won't significantly contribute to your daily purine load. For context, staying under 400 mg of purines daily during maintenance is a reasonable target for most people with gout. A medium onion (about 150 g) would provide roughly 14 mg of purines—a small fraction of that limit. The cooking method does matter slightly: boiling reduces purines to 7 mg per 100 g, while roasting increases them to 12.9 mg per 100 g. You can eat yellow onions freely as part of balanced meals, and their flavour means you won't need to rely on purine-heavy ingredients for taste. Remember to stay well hydrated throughout the day, as water helps your kidneys flush uric acid more effectively.
Purines by preparation
Cooking slightly changes the purine concentration per 100 g.
During a flare vs daily maintenance
🔴 During a flare
Yellow onion stays a reasonable choice, but reduce portions and prioritise hydration (2 L/day).
🟢 Daily maintenance
Yellow onion fits easily into a balanced gout-friendly diet, within the 400 mg purines per day limit.
Similar foods
Frequently asked questions
Can I eat yellow onions every day if I have gout?
Yes, yellow onions are safe to eat daily because they contain only 9.4 mg of purines per 100 g. They're low enough that even regular consumption won't push you toward problematic purine levels, so you can use them freely in your cooking.
Does cooking yellow onions change their purine content?
Yes, it does slightly. Boiling reduces purines to 7 mg per 100 g, while roasting increases them to 12.9 mg per 100 g. Even roasted, however, the difference is small—all cooking methods keep yellow onions in the safe, low-purine range.
Should I avoid yellow onions during a gout flare?
No, yellow onions are gentle enough to include even during a flare. Their low purine content makes them one of the vegetables you don't need to restrict, so you can continue to use them to add flavour to your meals.
Check any food in 2 seconds
Scan your plate with the Cha! AI assistant and track your purines daily. 1,000+ rated foods, 7-day free trial.
⚕️ Educational information — does not replace medical advice. Data: USDA / NIH, Kaneko 2014 thresholds.