Paleo Diet for Arthritis: What the Studies Show

By Paleo Life Coach Editorial Team · Last updated October 25, 2026 · Checked against American College of Rheumatology guidelines, NIAMS, the Arthritis Foundation, PubMed and USDA FoodData Central

Your joints hurt, and someone in a forum says going paleo put their arthritis “into remission.” Before you clear out the pantry, you want to know whether a paleo diet for arthritis has anything behind it besides stories. This guide goes through the evidence one arthritis type at a time: what the rheumatology guidelines say, which diets have actually been tested, where paleo has been tested (almost nowhere), and what a paleo eater with arthritis should get right.

The quick version: No trial has tested a paleo diet for rheumatoid, psoriatic or osteoarthritis. The American College of Rheumatology’s 2022 guideline recommends a Mediterranean-style diet for rheumatoid arthritis and conditionally recommends against other named diets, including paleo. Paleo can still help indirectly if it leads to weight loss, which guidelines recommend for osteoarthritis and psoriatic arthritis. It doesn’t replace medication.

Does the paleo diet help arthritis?

Nobody knows from direct evidence, because the studies haven’t been done. What exists is guideline advice for each arthritis type and trials of other diets, and those tell you which parts of paleo are likely to help and which aren’t.

“Arthritis” isn’t one disease. The National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) describes rheumatoid arthritis as a chronic autoimmune disease in which the immune system attacks the body’s own joint tissues (NIAMS). Psoriatic arthritis is an inflammatory condition of the joints and the places where tendons and ligaments attach to bone, driven by an overactive immune system (NIAMS). Osteoarthritis is different: a degenerative joint disease in which the tissues of the joint break down over time, and the most common type of arthritis (NIAMS). A diet claim that fits one may not fit the others.

We searched PubMed titles and abstracts on October 8, 2026 for “paleolithic diet” or “paleo diet” together with each arthritis type. Here’s what came back, set beside the guideline for that type.

Does the paleo diet help arthritis?
Arthritis type	What the guideline says about diet	Best diet evidence so far	Paleo or AIP studies found
Rheumatoid arthritis	ACR 2022: Mediterranean-style diet conditionally recommended; other formally defined diets, paleo included, conditionally recommended against	Two randomized Mediterranean-type trials of about 50 people each; one plant-based lifestyle program trial	Paleo: none. AIP: one uncontrolled pilot in 9 adults
Psoriatic arthritis	ACR/National Psoriasis Foundation 2018: weight loss conditionally recommended if you’re overweight or obese	Two weight-loss studies in which more people reached minimal disease activity	None
Osteoarthritis of the knee or hip	ACR/Arthritis Foundation 2019: weight loss strongly recommended if you’re overweight or obese; the recommendation names no diet	An 18-month randomized trial of 454 adults (IDEA)	None

Sources: England et al. 2023, Singh et al. 2019 and Kolasinski et al. 2020 (guidelines, linked below); PubMed searches run October 8, 2026. The osteoarthritis search returned one review article that mentions paleo in passing and no trial; the psoriasis search returned a narrative review and a phototherapy study, neither testing paleo for joints. A search for ankylosing spondylitis returned nothing.

Gout is also a form of arthritis, but it works through uric acid and has its own evidence. We cover it separately in paleo diet and gout.

What does the ACR guideline say about paleo and rheumatoid arthritis?

It names paleo and conditionally recommends against it for managing rheumatoid arthritis. The American College of Rheumatology (ACR) published its first guideline on diet, exercise and other integrative approaches for rheumatoid arthritis in 2023 (England et al.). It makes three diet recommendations, all conditional:

“Adherence to a Mediterranean-style diet is conditionally recommended over no formally defined diet.”
“Adherence to a formally defined diet, other than a Mediterranean-style diet, is conditionally recommended against.”
Following established dietary recommendations without dietary supplements is conditionally recommended over adding supplements.

The guideline lists the formally defined diets it evaluated: “anti-inflammatory, Mediterranean-style, ketogenic, paleo, gluten-free, vegetarian, vegan, intermittent fasting, elemental, elimination, raw foods, whole food plant-based.” So paleo falls under recommendation 2.

The stated reason matters. The panel found “no consistent, clinically meaningful benefit on physical function, pain, or disease activity specific to RA” for diets other than Mediterranean-style, and it weighed “the burden and costs that accompany adhering to a formally defined diet.” That’s a judgment about missing evidence and real effort. It isn’t a finding that paleo harms joints.

Two more points from the same document are worth knowing:

The Mediterranean recommendation is modest too. It rests on “low to moderate certainty of evidence of improvement in pain and no difference in physical function or disease activity.”
Diet comes with medication, never in place of it. The guideline says its recommended interventions “do not replace DMARD treatments.” DMARDs are disease-modifying antirheumatic drugs, the medicines that slow joint damage.

“Conditional” has a specific meaning here: the panel expects patients’ preferences to differ, so the choice belongs in a conversation with your rheumatology team. European guidance is similar in tone. The 2021 EULAR lifestyle recommendations emphasize “a healthy, balanced diet” for people with rheumatic diseases (Gwinnutt et al., 2023), and the evidence review behind them concluded that high-level evidence of clinically meaningful effects from individual dietary exposures “is missing” (Gwinnutt et al., 2022).

Has the autoimmune protocol been tested in rheumatoid arthritis?

Once, in nine people, without a control group. The autoimmune protocol (AIP) is the strict elimination version of paleo, and it’s the closest thing to a paleo study in arthritis.

In a pilot study from New Zealand, nine adults with rheumatoid arthritis ate their usual diet for 4 weeks and then followed AIP for 8 weeks (McNeill et al., 2026). Their medication had to be stable beforehand. What happened:

Mean RAPID3, a self-reported disease activity score out of 10, fell from 2.73 to 0.99. Seven of the nine improved.
Mean body mass index fell from 26.3 to 24.5. Eight participants lost weight, and the mean loss was 5 kg.
Six reported headaches in the first two weeks and seven had temporary digestive symptoms. One had ongoing diarrhea, and one had lethargy and loss of appetite with unintended weight loss.

The authors list the limits themselves: a small sample, no control group, self-selected and highly motivated participants, low disease activity at baseline, and outcomes that were all self-reported, with no blood markers of inflammation and no joint examination by a clinician. They call the findings “hypothesis-generating.” With a 5 kg average weight loss in the mix, nobody can say whether the food eliminations, the weight change or expectation produced the improvement.

The Arthritis Foundation’s dietitian-sourced summary lands in the same place: AIP “may be a last-line approach when less restrictive nutritional therapies have failed,” and people who are underweight, malnourished or pregnant should avoid it (Arthritis Foundation). Our AIP diet guide covers the phases and how to keep the protocol nutritionally complete.

How does paleo compare with the Mediterranean diet for arthritis?

The Mediterranean-style diet has small randomized trials in rheumatoid arthritis and a guideline recommendation. Paleo has neither. The two diets share more foods than they dispute, though, so the useful question is where a paleo plate departs from the pattern that was tested.

How does paleo compare with the Mediterranean diet for arthritis?
Trial	Who and how long	Diet tested	Result
Sköldstam et al., 2003	51 adults with rheumatoid arthritis on stable drug treatment, 12 weeks	Mediterranean diet vs ordinary Western diet	Disease activity score (DAS28) fell by 0.56 in the Mediterranean group; no significant change in controls
Vadell et al., 2020 (ADIRA)	50 adults with rheumatoid arthritis, crossover, 10 weeks per diet	Fish (mainly salmon) 3-4 times a week, legumes, whole grains, low-fat dairy, berries, nuts, probiotics vs a typical Swedish diet	No significant difference in the main analysis (P = 0.116); a small difference favoring the diet in unadjusted analysis
Walrabenstein et al., 2023	83 adults with rheumatoid arthritis, 16 weeks	Whole-food plant-based diet plus physical activity and stress management vs usual care	DAS28 improved 0.9 points more than control; the program group also lost 3.9 kg more

A 2018 systematic review found only four prospective studies and concluded the Mediterranean diet reduced pain and improved physical function in rheumatoid arthritis, while evidence for prevention was insufficient (Forsyth et al.). These are modest effects from small trials. Still, they’re trials. Note that the third one tested a diet with no meat at all, close to the opposite of paleo, and it came packaged with exercise and weight loss.

Now set the ACR’s definition of a Mediterranean-style diet beside paleo’s rules:

How does paleo compare with the Mediterranean diet for arthritis?
Food group	ACR Mediterranean-style definition	Paleo rule	Same direction?
Vegetables and fruits	Emphasized	Allowed	Yes
Nuts and seeds	Emphasized	Allowed	Yes
Olive oil	Emphasized	Allowed	Yes
Fish	Moderate amounts	Allowed	Yes
Added sugars, refined carbohydrates, highly processed foods	Limited	Excluded	Yes
Whole grains	Emphasized	Excluded	No
Low-fat dairy	Moderate amounts	Excluded	No
Saturated fat	Limited	No limit set	Depends on your choices
Sodium	Limited	Added salt excluded	Yes

Sources: Mediterranean-style definition from the ACR 2022 guideline (Table 1); paleo rules from the Harvard T.H. Chan paleo diet review.

Six rows agree. Paleo departs on whole grains and dairy, and on legumes, which the ADIRA trial served once or twice a week. The saturated fat row is in your hands: a paleo plate built on fish, olive oil, nuts and vegetables sits close to the tested pattern, and one built on bacon and coconut oil doesn’t. Our paleo vs Mediterranean diet comparison covers the two more broadly, and paleo vs anti-inflammatory diet looks at what the C-reactive protein studies found.

Can paleo help osteoarthritis by helping you lose weight?

Possibly, and only through the weight. For knee and hip osteoarthritis, the guideline evidence is about how much weight you lose and says nothing about which foods you cut.

The ACR/Arthritis Foundation guideline strongly recommends weight loss for people with knee or hip osteoarthritis who are overweight or obese (Kolasinski et al., 2020). It notes that a loss of 5% or more of body weight can be associated with changes in clinical outcomes, that benefits continue to increase at 5-10%, 10-20% and more than 20%, and that weight loss works better alongside an exercise program. NIAMS says the same in plainer words: losing weight if you’re overweight can help reduce pain, prevent more injury and increase mobility, especially in the knees and hips (NIAMS).

The mechanics are striking. In 142 overweight and obese older adults with knee osteoarthritis, each kilogram of weight lost was associated with about a 4-kilogram reduction in the compressive load on the knee with each step. The authors concluded that “each pound of weight lost will result in a 4-fold reduction in the load exerted on the knee per step” (Messier et al., 2005).

Can paleo help osteoarthritis by helping you lose weight?
Starting weight	5% loss	Knee load removed per step	10% loss	Knee load removed per step
160 lb	8 lb	about 32 lb	16 lb	about 64 lb
200 lb	10 lb	about 40 lb	20 lb	about 80 lb
240 lb	12 lb	about 48 lb	24 lb	about 96 lb
280 lb	14 lb	about 56 lb	28 lb	about 112 lb

Calculation: starting weight x 0.05 or 0.10, then x 4 using the ratio reported by Messier et al. 2005. The ratio is an average association from one study of walking, not a prediction for any one person.

The largest trial backs the combination of diet and exercise. In the IDEA trial, 454 overweight and obese adults aged 55 and over with knee osteoarthritis were randomized to diet-induced weight loss, exercise, or both for 18 months. The diet-plus-exercise group lost 10.6 kg (11.4% of body weight) and ended with less pain and better function than either single approach (Messier et al., 2013). The trial’s diet wasn’t paleo.

So where does paleo fit? Harvard’s review says some small, short trials found greater short-term weight loss on paleo than on guideline-based diets, in studies of fewer than 40 people lasting six months or less. If paleo is the way of eating that helps you lose 5-10% and keep it off, your knees get the benefit of the weight. Any diet you can sustain would do the same.

Our paleo diet pros and cons guide covers why results often fade, and the TDEE and macro calculator gives you a calorie estimate to start from. If you aren’t overweight, there’s no evidence that changing to paleo does anything for osteoarthritis.

What about paleo for psoriatic arthritis?

There are no paleo studies, and the diet evidence that exists is again about weight. The ACR/National Psoriasis Foundation guideline conditionally recommends weight loss for people with psoriatic arthritis who are overweight or obese, “in order to potentially increase pharmacologic response,” and rates the evidence as low quality (Singh et al., 2019).

Two studies show why. In 126 overweight or obese people starting a TNF blocker, those who lost 5% or more of their weight were more likely to reach minimal disease activity after six months. It was reached by 23.1% of those who lost under 5%, 44.8% of those who lost 5-10% and 59.5% of those who lost more than 10%, and the authors found this held “regardless of the type of diet” (Di Minno et al., 2014). In a second study, 41 people with psoriatic arthritis and obesity followed a medically supervised very low energy diet; the share in minimal disease activity rose from 29% to 54% (Klingberg et al., 2019). That was a supervised program with medication held constant, not something to copy at home.

NIAMS sums up the practical point: achieving and maintaining a healthy weight places less strain on your joints “and may help you respond better to medications” (NIAMS).

Should you cut nightshades if you have arthritis?

Not by default. Tomatoes, peppers and eggplant are ordinary paleo foods. AIP removes them along with potatoes, and they’re often blamed for joint pain. The Arthritis Foundation’s review of the question says, “There’s little scientific evidence on either side,” and notes that the animal studies conflict and rarely translate to people (Arthritis Foundation).

If you suspect a reaction, the Foundation describes a simple test: stop eating nightshades for two weeks, then reintroduce them one at a time with about three days between each. If symptoms return, leave that food out and replace its nutrients with other vegetables. If nothing changes, keep eating them.

What should a paleo plate cover if you have arthritis?

Calcium and fish, on purpose. The first matters because paleo removes dairy and arthritis raises the stakes for bone. NIAMS notes that having rheumatoid arthritis increases your risk of osteoporosis, “particularly if you take corticosteroids,” and that a healthy diet with a balance of calories, protein and calcium is important (NIAMS). The second matters because fish is the part of the tested Mediterranean pattern that paleo keeps.

What should a paleo plate cover if you have arthritis?
Paleo food (serving)	Calcium (mg)	Share of 1,000 mg RDA	EPA + DHA omega-3 (g)
Sardines, canned in oil, with bones, 1 can (92 g)	351	35%	0.90
Collard greens, boiled, 1 cup (190 g)	268	27%	0
Sockeye salmon, canned, with bones, 3 oz (85 g)	203	20%	0.98
Turnip greens, boiled, 1 cup (144 g)	197	20%	0
Kale, boiled, 1 cup (118 g)	177	18%	0
Bok choy, boiled, 1 cup (170 g)	158	16%	0
Almonds, 1 oz (28 g)	76	8%	0
Atlantic herring, cooked, 3 oz (85 g)	63	6%	1.71
Atlantic salmon, farmed, cooked, 3 oz (85 g)	13	1%	1.82
Atlantic mackerel, cooked, 3 oz (85 g)	13	1%	1.02

Calculation: USDA FoodData Central SR Legacy per-100 g values x serving weight. Entries: sardines 175139, collards 170407, canned sockeye 174226, turnip greens 170466, kale 169238, bok choy 170391, almonds 170567, herring 175117, farmed Atlantic salmon 175168, mackerel 175120. The calcium RDA is 1,000 mg for women 19-50 and men 19-70, and 1,200 mg for women 51 and over and men 71 and over (Harvard T.H. Chan).

A worked example: one can of sardines (351 mg), a cup of cooked collards (268 mg) and 3 oz of canned sockeye (203 mg) add up to 822 mg, or 82% of a 1,000 mg target, in a single day. It can be done without dairy, but only with planning, which is Harvard’s point when it says paleo eaters would need five or more servings of such greens and bone-in fish daily to meet calcium needs. Our guide to paleo calcium and nutrient gaps goes deeper, and the paleo seafood recipes make the fish easier to fit in.

On supplements, follow your doctor. The ACR guideline doesn’t recommend adding dietary supplements for managing rheumatoid arthritis itself, though it recognizes a role for some in bone and heart health. NIAMS advises talking to your doctor about your osteoporosis risk and the potential benefits of calcium and vitamin D.

Mistakes to avoid, and when to talk to your rheumatologist

Stopping or skipping medication because you feel better on a diet. NIAMS explains that rheumatoid arthritis can start damaging joints within the first year or two, and that the damage generally can’t be reversed. Feeling better and having controlled disease aren’t always the same thing. Never change or stop a prescribed medicine without your rheumatologist.

Reading weight-loss relief as proof that a food was the cause. In the AIP pilot, participants lost an average of 5 kg. Weight loss alone is linked to better outcomes in osteoarthritis and psoriatic arthritis.

Eliminating more and more foods. The Arthritis Foundation warns that following AIP long term can result in nutrient deficiencies. If a couple of weeks without a food changes nothing, bring it back.

Losing weight you can’t spare. If you’re underweight or losing weight without trying, a restrictive diet is the wrong tool. Tell your doctor.

Paying for a promise. The Arthritis Foundation puts it plainly: “No diet can cure arthritis.”

Talk to your rheumatologist or a registered dietitian before a major diet change if you take DMARDs, biologics or corticosteroids, if you’re pregnant, or if you have osteoporosis, kidney disease or another long-term condition. Both NIAMS and the ACR guideline name dietitians as part of the arthritis care team.

Frequently asked questions about paleo and arthritis

Is the paleo diet good for rheumatoid arthritis?

There’s no trial evidence that it is. A PubMed search on October 8, 2026 found no study of a paleo diet in rheumatoid arthritis. The 2022 American College of Rheumatology guideline conditionally recommends a Mediterranean-style diet and conditionally recommends against other formally defined diets, a list that includes paleo, because it found no consistent, clinically meaningful benefit.

Can the paleo diet cure arthritis or put it into remission?

No diet has been shown to cure arthritis, and the Arthritis Foundation says so directly. In one nine-person AIP study, some participants’ self-reported scores reached the remission range, but there was no control group, no blood testing and no examination by a clinician. Treatment decisions belong with your rheumatologist.

Is paleo or Mediterranean better for arthritis?

The Mediterranean-style diet has the evidence: small randomized trials in rheumatoid arthritis and a conditional recommendation from the American College of Rheumatology. Paleo has no arthritis trials. The two overlap on vegetables, fruit, nuts, olive oil and fish, and differ on whole grains, legumes and dairy.

Does the paleo diet help osteoarthritis?

Only indirectly, as far as anyone knows. No study has tested paleo in osteoarthritis. Guidelines strongly recommend weight loss for people with knee or hip osteoarthritis who are overweight, and one study linked each pound lost to about four pounds less load on the knee per step. Paleo helps if it helps you lose weight and keep it off.

Does the AIP diet help rheumatoid arthritis?

It’s been tested once, in nine adults for eight weeks with no control group. Seven improved on self-reported scores, and they also lost an average of 5 kg. The researchers called the result hypothesis-generating. The Arthritis Foundation describes AIP as a possible last-line approach and warns about nutrient deficiencies if it’s followed long term.

Are nightshades bad for arthritis?

The evidence doesn’t show that. The Arthritis Foundation says there’s little scientific evidence either way. If you think tomatoes, peppers, eggplant or potatoes worsen your symptoms, it suggests leaving them out for two weeks and then reintroducing them one at a time, about three days apart, to see whether anything changes.

Your next step: keep the parts with evidence

If you already eat paleo and have arthritis, you don’t need to abandon it, and you shouldn’t expect it to treat your joints. Shift the plate toward the pattern that has been tested: fish a few times a week, olive oil as your main fat, plenty of vegetables and nuts, less red and processed meat. Plan your calcium.

If you’re carrying extra weight, set a 5% target and pair it with movement your joints tolerate. Then take the plan to your rheumatologist. For the paleo basics behind all of this, start with what the paleo diet is.

Consider this general nutrition reading, not a replacement for advice from your rheumatologist, doctor or a registered dietitian. Don’t stop or change any arthritis medication because of a diet, and talk to your doctor before making major changes to how you eat.

Paleo Diet for Arthritis: What the Guidelines and Studies Show for Rheumatoid, Psoriatic and Osteoarthritis