Diet won't cure RA or replace your medication — but a few dietary levers genuinely help, and one supplement has real trial evidence. The honest headline: eat Mediterranean, add fish oil, feed your gut fibre, and skip the elimination-diet rabbit holes.
A Mediterranean diet — lots of fish, vegetables, olive oil, and whole grains; little ultra-processed food and sugar — is the best-evidenced eating pattern for RA. The joint benefit is modest (a small drop in disease activity), but it also meaningfully cuts the cardiovascular risk RA raises. It's the safe, sustainable base to build on. Evidence ●●●○○
Omega-3 fish oil is the standout supplement with genuine RA data: at a high dose (~2–3 g/day of combined EPA+DHA — several capsules, not one), it reduces morning stiffness and, most clearly, cuts how many painkillers people need. It takes 2–3 months to build up. Worth it — the rare supplement that's earned its place in RA. Evidence ●●●●○
Brief fasting followed by a plant-based diet produced real short-term improvement in the classic trials — but symptoms return on normal eating, so it's hard to sustain. Individual elimination diets help some people but risk over-restriction and can't be predicted. The gut microbiome is a hot frontier (RA is linked to gut dysbiosis), but no probiotic has been shown to control the disease — the reliable, actionable version of 'fix your gut' is simply eating more fibre and plants. Evidence ●●●○○ (fasting) / ●●○○○ (probiotics)
The food plan that's actually backed
Mediterranean pattern + high-dose fish oil + plenty of fibre. Skip the boutique probiotics and single-food witch-hunts — and never swap food for your DMARD. Diet is a genuine adjunct here, not an alternative.
The RA Guide