Rheumatoid Arthritis Diet: What to Eat, Limit and Avoid

What diet can and can't do in RA

RA is an autoimmune disease. The immune system attacks the joint lining (synovium), and without effective treatment this erodes cartilage and bone. Modern care treats to a target of remission or low disease activity, starting DMARDs such as methotrexate early (see rheumatoid arthritis). No diet trial has shown that food alone can prevent joint erosions the way DMARDs do. Strong

Guideline groups still take diet seriously. In 2022 the American College of Rheumatology (ACR) issued its first guideline on integrative care for RA, to be used together with DMARDs. It includes three diet recommendations, and all of them are conditional. The main one favours following a Mediterranean diet rather than no particular diet.¹ The 2021 EULAR lifestyle recommendations for rheumatic and musculoskeletal diseases also support a healthy, balanced diet, a healthy weight, exercise and not smoking. They are frank that the direct evidence on disease progression is limited.²

The holistic view that food is part of treatment and the mainstream view that DMARDs come first are not really in conflict. A good RA diet supports drug treatment and does not compete with it.

The trial evidence, diet by diet

Diet trials in RA are small, short and hard to blind, because people know what they are eating. A Cochrane review of 14 randomised trials and one controlled trial (837 patients in total) could not pool the results. The interventions and outcomes varied too much, and many trials reported their data poorly. It rated the effects of dietary change in RA as uncertain and noted more drop-outs and weight loss on the diets.³ A later systematic review of 70 human studies reached a similar balanced view: the Mediterranean diet improved some disease-activity measures, fasting gave significant but short-lived improvements, and responses to vegetarian or elimination diets were very individual.⁴

Mediterranean diet Emerging (RA activity) Strong (heart health)

The Mediterranean pattern is built on vegetables, fruit, legumes, whole grains, nuts, extra-virgin olive oil and fish, with little red and processed meat. It has the most consistent support of any pattern in RA. In Sköldstam's trial, patients ate the Cretan-style diet in a hospital canteen for the first three weeks to help them stick to it. The difference from controls showed up only in the second half of the 12 weeks.⁵ The MEDRA authors drew an important lesson from their own result: because the healthy-eating comparison group also improved, the benefit probably comes from better overall diet quality rather than from any single ingredient.⁶ This page uses the same pattern as the anti-inflammatory diet plan.

The ADIRA anti-inflammatory diet trial Emerging

ADIRA ("Anti-inflammatory Diet In Rheumatoid Arthritis") tested a combination of foods that each had some earlier evidence: whole grains, fatty fish, nuts, vegetables, fruit and probiotics. The comparison diet resembled average Swedish eating. The trial ran as a single-blind crossover, so each of 50 patients spent 10 weeks on each diet, with a four-month washout between them. On the pre-specified main analysis, the change in DAS28-ESR did not differ significantly between diets (p = 0.116). In the 44 people who completed both periods, DAS28-ESR was lower after the anti-inflammatory diet (median 3.05 vs 3.27, p = 0.04). The authors called this an indication of benefit that needs larger trials.⁷ A 2021 analysis of the same trial found lower triglycerides, higher HDL cholesterol and a less atherogenic apolipoprotein ratio on the intervention diet, even though weight stayed stable.⁸ That is a cardiovascular benefit, which matters in RA (see heart risk).

Fasting, vegetarian and vegan diets Contested

The 1991 Norwegian trial is still the most-cited RA diet study. After a 7–10 day subtotal fast and an individually adjusted vegetarian diet, patients improved on many measures compared with controls, and the benefit lasted a year.⁹ But the trial was small and unblinded. The Cochrane review notes that its effect on pain was clear, while effects on function and morning stiffness were not.³ The 2022 NutriFast trial looked at fasting in people taking modern drugs. A 7-day fast followed by a plant-based diet was no better than a guideline-based diet on physical function. Both groups improved in disease activity (DAS28 fell by about 1 point in each), and the fasting group lost more weight (3.9 kg vs 0.7 kg).¹⁰ Gluten-free vegan diets show a similar pattern, with some strong responders but high drop-out. For a full analysis, see gluten-free diets in RA.¹¹

Elimination diets Emerging (individual use) Contested (as a general RA diet)

In a survey of 217 people in a U.S. RA registry, 24% said food affected their symptoms. Sugary soda and desserts were the foods most often blamed, and blueberries and spinach the foods most often said to help.¹² Self-reports like these are prone to recall bias. There are few controlled trials of single trigger foods such as nightshades, dairy or gluten, and the Cochrane review rated elimination diets as uncertain.³ A short, structured elimination and reintroduction trial with a dietitian is a reasonable way to test a personal suspicion. Long-term restriction without a plan is not. See foods that may worsen arthritis, nightshades and diet and flare triggers.

Specific foods and nutrients

Oily fish and omega-3 fats Emerging

In a U.S. RA cohort of 176 people, eating fish twice a week or more was linked to a DAS28-CRP about 0.49 points lower than eating fish less than once a month. Each extra weekly serving was linked to a 0.18-point drop. This was a cross-sectional study, so it shows an association, not proof.¹³ For supplements, an Australian trial in early RA added high-dose fish oil (5.5 g/day) or a low-dose control to treat-to-target triple DMARD therapy. The fish-oil group had fewer triple-DMARD failures (HR 0.28) and reached ACR remission more often (HR 2.17).¹⁴ Pooled across 23 placebo-controlled trials, though, the effects on pain and joint counts were small and the certainty of evidence was low to very low.¹⁵ A practical reading: eat oily fish such as salmon, sardines, mackerel or trout about twice a week. Treat high-dose fish oil as a question for your rheumatologist, because it can add to bleeding risk with anticoagulants (see omega-3 supplements).

Fiber, the gut microbiome and short-chain fatty acids Emerging

Gut bacteria ferment dietary fiber into short-chain fatty acids (SCFAs) such as butyrate and propionate. In animal models these help regulate the "gut–joint axis". In a German feasibility study, 36 people with RA on routine treatment ate high-fiber bars or cereal daily for 28 days. Regulatory T cells increased, the Th1/Th17 balance improved, markers of bone erosion fell and patient-reported outcomes improved. However, the study had no control group, and the fiber products were supplied by a spin-off company linked to some of the authors.¹⁶ The idea is promising and fits the Mediterranean and ADIRA patterns, but it is not yet proven to change disease activity. Getting fiber from whole foods is low-risk anyway. For more on the gut, see leaky gut and arthritis.

Extra-virgin olive oil Emerging

In a Greek case–control study of 145 people with RA and 188 controls, the highest olive oil intake was independently linked to lower odds of having RA (OR 0.38), as was cooked vegetable intake (OR 0.24).¹⁷ Case–control diet studies are prone to recall bias, and olive oil has not been tested on its own in a large RA trial. Its main role is as the everyday fat in a Mediterranean pattern. Use it in place of butter, lard and trans-fat-containing spreads, not on top of them.

Sugary drinks and RA risk Emerging

In the U.S. Nurses' Health Studies (186,900 women), drinking one or more sugar-sweetened sodas a day was linked to a 63% higher risk of developing seropositive RA. Diet soda showed no such link.¹⁸ The French E3N cohort of 62,631 women did not confirm this.¹⁹ In the same U.S. cohorts, women aged 55 or younger whose overall diet quality was in the top quarter had about a third lower risk of RA (HR 0.67).²⁰ These are studies of who develops RA, not of how RA behaves once you have it. Even so, cutting sugary drinks is sensible for weight, heart and dental health, and soda was the item most often blamed for worse symptoms in the registry survey.¹² More detail is in sugar and joint pain.

Red and processed meat Contested

The evidence against red meat in RA is weaker than often claimed. In 82,063 women followed for over 20 years, intake of protein, iron, red meat, poultry and fish was not linked to RA risk.²¹ No trial has isolated red meat as an RA trigger. That said, the diets with the best RA trial results all contain little red or processed meat. Processed meat is also linked to cardiovascular disease, which is already more common in RA. Eating it occasionally rather than daily is a reasonable middle ground. For gout, purine-rich meat is a different and clearer story (see gout).

Alcohol Strong (methotrexate caution) Contested (any benefit)

Cohort studies link light-to-moderate drinking with a slightly lower risk of developing RA. A dose-response meta-analysis of 8 prospective studies found a relative risk of 0.86, and the apparent benefit disappeared at about 30 g a day.²² That observational finding is not a reason to start drinking. It also says nothing about drinking safely once you take liver-processed RA drugs. In 11,839 people with RA starting methotrexate, drinking less than 14 UK units a week (about 112 g of alcohol) was not linked to more liver-enzyme spikes. Drinking 15–21 units carried a possible increase, and more than 21 units a week raised the risk significantly (HR 1.85).²³ Your prescriber's advice on alcohol with methotrexate or leflunomide comes first, because it depends on your liver tests and other conditions.

Salt (sodium): the Th17 hypothesis Emerging (mechanism) Contested (human RA evidence)

A 2013 Nature study showed that high salt concentrations sharply boost pro-inflammatory Th17 cells in mouse and human cells in the lab. Mice fed a high-salt diet developed a more severe autoimmune disease, but this was a model of multiple sclerosis, not RA.²⁴ The evidence in people with RA is much less tidy:

• In a Swedish nested case–control study (386 cases), sodium intake was not linked to RA overall. A link appeared only in smokers (OR 2.26), and the authors said this did not confirm their hypothesis.²⁵
• A Spanish cross-sectional analysis (18,555 people, self-reported RA) found higher odds of RA with the highest sodium intake (OR 1.5). There the association was stronger in never-smokers, the opposite of the Swedish finding.²⁶
• In 336 Japanese patients with RA, a higher urine sodium-to-potassium ratio went with higher disease activity and more high blood pressure. This was a snapshot study that cannot show cause and effect.²⁷

No randomised trial has shown that cutting salt lowers RA disease activity. Still, limiting salt is good advice for blood pressure and heart health, which RA, NSAIDs and steroids all affect. The DASH-style approach of more potassium-rich vegetables, fruit and legumes and fewer salty processed foods fits that goal.

Diet and heart risk in RA Strong

Cardiovascular disease, not joint damage, is a leading cause of early death in RA. A meta-analysis of 24 studies (111,758 patients) found about a 50% higher risk of cardiovascular death in RA than in the general population.²⁸ Chronic inflammation, steroids, NSAIDs, inactivity and conventional risk factors all contribute. EULAR therefore recommends regular cardiovascular risk assessment in RA, good control of disease activity, and lifestyle advice on diet, exercise and stopping smoking.²⁹

Many of the diet changes that might help RA, such as more fish, olive oil, fiber and legumes and less salt, processed meat and sugary drinks, are the same changes that protect the heart. That makes heart health the most solid reason to improve your diet in RA, even when the effect on joints is uncertain. Ask your doctor about checking your lipids, blood pressure and blood glucose (see biomarkers).

Weight, obesity and treatment response Strong (association) Emerging (weight-loss benefit)

Fat tissue is metabolically active and releases inflammatory signals. A meta-analysis of 54 cohorts (19,372 patients with immune-mediated diseases) found that people with obesity had 60% higher odds of failing TNF-inhibitor therapy. The risk rose by about 6.5% for each 1 kg/m² increase in BMI, and the pattern held across rheumatic diseases including RA.³⁰ This is observational, and obesity also inflates some disease-activity scores. A 2024 review found that weight loss after bariatric surgery has been linked to lower disease activity and more remission in RA. For weight loss through a low-calorie diet, the evidence comes from only a few observational studies, and no randomised trial has yet shown a benefit.³¹

A sensible goal is slow, steady loss that preserves muscle if you are carrying excess weight. Combine a Mediterranean-style diet with enough protein and the strength and aerobic exercise EULAR recommends (see exercise and movement). Avoid crash diets. RA can already cause muscle loss, and steroids make it worse. Unexplained weight loss in RA is a reason to see your doctor, not something to celebrate.

Drug–diet interactions Strong

Food matters most where it meets your medicines. The table summarises common RA drug–food issues. Your prescriber or pharmacist can tell you which apply to you.

A practical RA plate and sample day

You don't need special products. A simple plate model puts the Mediterranean and ADIRA patterns into practice:

Sample day

Foods to favour and foods to limit

Testing your own response

Group trials tell you what works on average. Your own response may differ. If you want to see whether a diet change helps you, change one thing at a time and give it 8–12 weeks, which matches the length of most RA diet trials. Keep your medication unchanged, and track your symptoms the same way throughout. Our free flare tracker lets you log pain, stiffness, fatigue and possible triggers so you can bring a clear record to your rheumatologist. Your rheumatologist can also compare blood markers such as CRP and ESR (see CRP vs ESR) and disease-activity scores before and after the change.

When to see a doctor Strong

Book a routine appointment if you:

• plan a major diet change, fast or elimination diet, or want to start supplements;
• have unexplained weight loss, poor appetite or signs of deficiency such as fatigue or mouth sores;
• are unsure how much alcohol is safe with your medication;
• still have active joints despite treatment. Diet is not a reason to delay changing DMARDs if they aren't working.

Related pages

Frequently asked questions

References

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