Are Tomatoes Bad for Gout? Separating Myth from Research
Tomatoes are low in purines but some gout patients report them as triggers. Here's what the research says about tomatoes, uric acid, and why individual responses vary.
Tomatoes and gout is one of the most debated topics in gout management. Some sources say tomatoes are perfectly safe (they’re low in purines), while others warn they’re a hidden trigger. Let’s look at what the research actually tells us.
The Purine Argument: Tomatoes Are Low Risk
From a purine standpoint, tomatoes are clearly in the safe zone:
- Fresh tomatoes contain only about 5mg of purines per 100g
- For comparison, raw chicken breast has about 160mg and beef liver about 210mg per 100g
- Vegetable purines in general have not been linked to increased gout risk in large population studies - this is one of the most persistent gout myths
If purines were the only factor, tomatoes would be one of the safest foods you could eat with gout.
The Plot Twist: The 2015 New Zealand Study
A 2015 study published in BMC Musculoskeletal Disorders by researchers at the University of Otago surveyed 2,051 New Zealanders with gout and found something interesting:
- Of the 1,447 respondents who named at least one food trigger, 20.2% listed tomatoes (about 14% of everyone surveyed)
- Tomatoes were the 4th most commonly reported food trigger (after seafood, alcohol, and red meat)
- The researchers then analyzed data from three large US cohort studies (12,720 people) and found a statistically significant association between tomato consumption and higher serum uric acid levels
The proposed mechanism? Tomatoes contain relatively high levels of glutamate (an amino acid), which can act as a precursor in uric acid synthesis pathways.
Putting It in Perspective
Before you throw out all your tomatoes, some important context:
The effect per serving is small
Each additional weekly serving of tomatoes was linked to serum uric acid only about 0.66 µmol/L higher, which works out to less than 0.1 mg/dL even for a daily serving. The researchers argued that this per-serving effect was comparable to other established dietary risk factors, but in absolute terms it is small next to the roughly 0.46 mg/dL linked to each daily beer in US survey data.
Tomatoes have protective compounds too
Tomatoes are rich in:
- Vitamin C - Associated with lower uric acid levels and reduced gout risk
- Lycopene - A powerful antioxidant with anti-inflammatory properties
- Potassium - Supports kidney function and uric acid excretion
- Fiber - Supports gut health, where 30% of uric acid excretion occurs
Self-reported triggers are unreliable
The trigger figures come from self-reporting, which is subject to recall bias and confirmation bias. People who believe tomatoes trigger their gout may notice flares after eating them while ignoring times they ate tomatoes without a flare.
The Individual Factor
This is where it gets personal. Gout triggers vary significantly between individuals because of differences in:
- Kidney function and uric acid clearance efficiency
- Gut microbiome composition (affects intestinal uric acid excretion)
- Metabolic health (insulin resistance, metabolic syndrome)
- Genetic factors affecting urate transporters
- Overall dietary patterns (a tomato with beer is different from a tomato with water)
Some people may genuinely find that tomatoes contribute to their flares. Others eat tomatoes daily without any issues. The only way to know which group you fall into is to track your personal data.
What the Experts Recommend
Most rheumatologists and gout specialists take a pragmatic approach:
- Don’t eliminate tomatoes preemptively based on one study
- Track your response - Log when you eat tomatoes and whether flares follow. An app like Urica can help you track your gout triggers systematically.
- Consider the full context - What else did you eat? How was your hydration? Your stress level?
- If you suspect tomatoes, try eliminating them for 2-3 weeks, then reintroduce and observe
Cooked vs. Raw Tomatoes
If you’re tracking tomato intake, note that cooking concentrates certain compounds:
- Tomato sauce has higher glutamate concentration per serving than fresh tomatoes
- Tomato paste is even more concentrated
- Fresh tomatoes in salads have the lowest concentration
- Cooking increases lycopene bioavailability (a potential benefit)
The Bottom Line
Tomatoes are a low-purine food with some evidence suggesting they may modestly increase uric acid in some people, possibly through their glutamate content. The effect is small, and tomatoes also contain compounds that may be protective (vitamin C, lycopene). Rather than eliminating them, track your personal response and look for patterns over time.
The most important dietary triggers for gout remain alcohol (especially beer), sugary drinks with high-fructose corn syrup, and organ meats. Tomatoes are likely a minor factor at most for the majority of gout sufferers. For more on how different foods affect gout, see our complete guide to gout and food.
This article is for informational purposes only and is not medical advice. Consult your rheumatologist or healthcare provider about your specific dietary needs.
Track Your Personal Response
Everyone responds differently to foods. Urica helps you track how specific foods affect YOUR flare patterns by analyzing purines, fructose, and glycemic load together — not just purines alone.
Frequently Asked Questions
Are tomatoes bad for gout?
Tomatoes are very low in purines (about 5mg per 100g) and were traditionally considered safe for gout. However, in a 2015 New Zealand study, about 20% of gout patients who named a food trigger listed tomatoes, and in US data on 12,720 people, eating more tomatoes was linked to slightly higher serum uric acid. The researchers suggested tomatoes' glutamate content as a possible reason. The effect is modest and varies between individuals - tracking your personal response is the best approach.
Do tomatoes increase uric acid?
Research suggests tomatoes may modestly increase serum uric acid levels; the researchers proposed glutamate, which tomatoes are rich in, as a possible reason. However, the effect is small compared to high-purine foods, alcohol, or fructose. Tomatoes are also rich in vitamin C and lycopene, which may have protective effects against gout.
Can I eat tomato sauce with gout?
Tomato sauce concentrates the compounds found in fresh tomatoes, so if you're sensitive to tomatoes, sauce may have a stronger effect. However, many gout sufferers eat tomato-based dishes without issues. Track your intake and flares to determine your personal response rather than eliminating tomato sauce preemptively.
What vegetables should you avoid with gout?
Research consistently shows that vegetable purines do NOT increase gout flare risk. Even vegetables traditionally listed as high-purine, like spinach, asparagus, and mushrooms, have not been linked to higher gout risk in large studies (newer analyses put asparagus and white mushrooms in the low band anyway). Vegetables are generally protective due to their fiber, vitamin C, and antioxidant content.