DASH lowered rheumatoid arthritis disease activity by 0.75 points — joint counts and CRP did not move
A 12-week randomized trial in 82 adults with active seropositive rheumatoid arthritis found the DASH diet lowered disease activity by 0.75 points more than usual eating, with pain and physical function improving while CRP and joint counts held — so the decision it supports is a produce-first DASH plate kept alongside your medication, and modest expectations about what it changes.
Eighty-two adults with active, seropositive rheumatoid arthritis joined a twelve-week randomized trial run by a research team at Istanbul Health and Technology University. Forty of them followed the DASH diet; forty-two kept eating as they already did. 1
Disease activity fell further on DASH. Measured with DAS-28-ESR, the score dropped 0.92 points in the DASH group and 0.17 points in the control group, a 0.75-point difference (p = 0.001). 1 Pain ratings, general health, physical function and six of the eight quality-of-life domains improved more on DASH. 1
Three readings went the other way. C-reactive protein showed no difference between the groups. Neither did the count of tender joints or the count of swollen joints. 1 The diet changed what people reported and how fast their red cells settled; the joint examination and the main inflammatory protein held still.
The trial went online in Clinical Nutrition on 1 October 2026. 2
What the trial did
Participants were 18 to 64 years old. All had seropositive rheumatoid arthritis under the 2010 ACR/EULAR criteria, and all were in an active phase of the disease. 3
Everyone had lived with the disease for at least a year. None had tried a diet aimed at arthritis before. 3
Drug regimens were held steady before the trial began. Disease-modifying drugs had to be unchanged for three months, steroids for four weeks at no more than 12.5 mg of prednisolone a day, anti-inflammatories for ten days. 3 Supplements were limited to calcium and vitamin D for people on steroids, plus the folic acid that comes with methotrexate. 3
The DASH arm got a plan built around each person's resting metabolic rate and daily activity. Three-day food records and a DASH adherence score tracked how well it was followed. 3 The control arm received no dietary programme. 3
Forty-nine of the 82 participants finished the twelve weeks, and the analysis kept everyone in the group they were assigned to. 1
What changed in twelve weeks
| Measure | Difference between groups |
|---|---|
| DAS-28-ESR (disease activity) | −0.75 points, p = 0.001 1 |
| DAS-28-CRP | −0.62 points, p < 0.05 1 |
| Erythrocyte sedimentation rate | −3.90 mm/h, p < 0.05 1 |
| Pain, 0–10 scale | −2.19 points, p < 0.05 1 |
| General health, 0–10 scale | −2.12 points, p < 0.05 1 |
| Health Assessment Questionnaire, disability 0–3 | −0.38 points, p < 0.05 1 |
| SF-36 physical function | +10.15 points, p < 0.05 1 |
| SF-36 role limitations, physical | +47.30 points, p < 0.05 1 |
| SF-36 bodily pain | +22.17 points, p < 0.05 1 |
| SF-36 vitality | +18.52 points, p < 0.05 1 |
| C-reactive protein | no difference, p > 0.05 1 |
| Tender joint count | no difference, p > 0.05 1 |
| Swollen joint count | no difference, p > 0.05 1 |
The journal's summary reports the change from baseline only for the two disease-activity scores, so the rest of the table gives the comparison between groups. 1
Adherence tracked the result inside the DASH arm. The DASH score rose over the twelve weeks, and the more it rose, the more both disease-activity scores fell. 1
What a 0.75-point drop means
Rheumatology grades a DAS-28 change in bands. An improvement above 1.2 points counts as a good response. A change between 0.6 and 1.2 counts as a moderate response, provided the score sits at 5.1 or lower when it is measured again. 4
The trial required an active score at entry, and the authors describe the fall they measured as clinically meaningful. 1 Whether every participant who improved cleared the band depends on the score they finished on, which the summary does not give.
The score itself explains the shape of the result. DAS-28 adds together the swollen joint count, the tender joint count, the erythrocyte sedimentation rate or C-reactive protein, and the patient's own rating of disease activity. 5 Two of those four inputs come from how the person feels, one is a blood reading, and one is a clinician's count.
So the improvement landed in the parts of the score that patients report, plus the sedimentation rate. The clinician-counted joints and the C-reactive protein gave nothing back. 1 A person starting this diet could reasonably expect less pain and better daily function. A rheumatologist would not expect the joint count to change at the next appointment.
What DASH looks like on a plate
DASH was designed to lower blood pressure. The National Heart, Lung, and Blood Institute publishes it as daily and weekly targets rather than a menu. 6 At 2,000 calories a day:
| Food group | Target | What a serving is |
|---|---|---|
| Grains | 6–8 a day | Mostly whole grains: bread, cereal, rice, pasta 6 |
| Vegetables | 4–5 a day | Fresh, frozen or canned without salt 6 |
| Fruit | 4–5 a day | Whole fruit ahead of juice 6 |
| Low-fat or fat-free dairy | 2–3 a day | Milk, yogurt, cheese 6 |
| Meat, poultry, fish | 6 ounces or less a day | Lean cuts, skin removed 6 |
| Fats and oils | 2–3 a day | Vegetable oils, soft spreads 6 |
| Nuts, seeds, dry beans and peas | 4–5 a week | Unsalted 6 |
| Sweets | 5 a week or less | Sugar, jam, sweetened drinks 6 |
| Sodium | 2,300 mg a day, or 1,500 mg | 1,500 mg lowers blood pressure further 6 |
That pattern fills a plate with produce, whole grains and low-fat dairy, and leaves little room for red meat, sweets and salt. 6 The trial adjusted the servings to each participant's energy needs, so they moved with body size and activity rather than sitting at the 2,000-calorie figures. 3
Where this sits against the arthritis guidance
European rheumatology has examined this question at scale. The evidence review behind the 2021 EULAR recommendations found no single dietary component that meaningfully improves rheumatic disease outcomes. 7 Most of the rheumatoid arthritis diet evidence was rated low or very low certainty, and fish oil, the best studied of the candidates, shifted pain by a standardised mean difference of about −0.27. 7
The recommendation drawn from that review is to eat a healthy, balanced diet and keep a healthy weight, for general health rather than for the arthritis itself. 7 The same diets look stronger on prevention. A 2021 meta-analysis of 12 observational studies covering 270,121 people put the odds of developing rheumatoid arthritis 46% lower for the healthiest eaters, though that figure fell to 16% when only the highest-quality studies were counted. 8 Prevention is a different question from relief, and observational data cannot separate the diet from the people who choose it.
One earlier trial tested a whole pattern rather than a nutrient. Forty-four adults with rheumatoid arthritis were randomized to a Mediterranean diet or to Ireland's national healthy-eating guidelines, both delivered by a dietitian over twelve weeks. 9 Both groups improved their physical function and quality of life, and the Mediterranean group finished better on both (p = 0.006 and p = 0.037). 9 The authors read that as overall diet quality doing the work, whichever pattern carried it. 9
Against that backdrop, the DASH result adds weight to the whole-pattern idea, in a field where single nutrients have disappointed.
Why it may still be the right pattern to pick
Rheumatoid arthritis carries its own reason to eat this way. The disease raises the risk of coronary artery disease roughly 1.5 to 2 times over the general population, and heart disease accounts for a large share of the excess deaths linked to it. 10
DASH has the longest record of any dietary pattern against that risk. In the original DASH trial, 459 adults ate a typical American diet, that diet with more produce, or DASH for eight weeks; DASH lowered blood pressure most, and follow-up reports found lower LDL cholesterol as well. 11 In DASH-Sodium, cutting sodium from about 3,300 mg to 1,500 mg a day lowered blood pressure further on both diets, and DASH at the lowest sodium did best of all. 11
Those benefits arrive whether or not the arthritis responds, which is a firmer footing for the diet than a disease-activity score that may move either way.
Where the edges are
DASH runs on potassium, around 4,700 mg a day from produce, dairy and legumes. 12 That load matters when kidney function is reduced, because raised blood potassium is the risk, and guidance calls for potassium to be individualized rather than pushed up. 12 If your kidney function is low, or you take a medicine that raises potassium, have the plan checked before you build it.
Sodium is the half people skip. 6 The 1,500 mg target is about two-thirds of a teaspoon of salt a day across everything you eat, which means processed and restaurant food has to come down before the salt shaker matters. 6
Medication stays where it is. The trial held disease-modifying drugs and steroid doses constant and added diet on top of them. 3 Nobody in it stopped treatment, and the improvements are what a diet added to stable drug therapy produced.
The comparison also favours the diet. The DASH group got a personalized plan, dietitian time and adherence feedback. The control group got no dietary programme at all. 3 Part of the gap between the groups will be that attention rather than the food itself.
The same-day decision
- Build one day to the DASH targets. Four to five servings each of vegetables and fruit, two to three of low-fat dairy, six to eight of mostly whole grains, and 6 ounces or less of meat, poultry and fish. Nuts and beans four to five times a week. 6
- Take the salt down in the right order. Cured meat, canned soup, salty bread and takeaway supply most of the sodium, so they come first; work toward 1,500 mg a day if your blood pressure allows it. 611
- Keep the drugs and the appointments. Tell your rheumatologist about the change, keep the disease-modifying drug and steroid doses as prescribed, and ask for a potassium check if your kidneys are not normal. 312
- Judge it at twelve weeks, with the same instruments. The trial measured disease activity, pain, general health and the Health Assessment Questionnaire at weeks 4, 8 and 12. 3 Your clinic records most of those already, so the comparison is ready at your next visit.
- Expect the pain and function to move before the blood work. The joint counts and C-reactive protein are the readings least likely to shift, and in this trial they stayed put. 1
What this piece could not check
The full report sits behind the publisher's paywall, so this article works from the journal's structured summary and the trial's registration record. 13 The participants' starting disease activity, their weights and the exact foods in each plan are therefore not reported here.
The trial came from one research group, lasted twelve weeks, and could not blind anyone to which diet they were on. 3 Thirty-three of the 82 participants left before the end, which widens the uncertainty around every estimate. 1 The Scientific and Technological Research Council of Türkiye funded the work, and the authors declared no competing interests. 12
A twelve-week result in 82 people is a signal worth acting on gently. It is a long way from proof that diet changes the course of rheumatoid arthritis.
References
- 1
- 2
- 3
- 4EULAR response criteria, DAS-28
das-score.nl
- 5Using the derived DAS28 patient-reported components index, PMC
pmc.ncbi.nlm.nih.gov
- 6
- 7
- 8
- 9
- 10Interplay of rheumatoid arthritis and cardiovascular disease, PMC
pmc.ncbi.nlm.nih.gov
- 11
- 12The DASH Diet and Cardiometabolic Health and Chronic Kidney Disease, PMC
pmc.ncbi.nlm.nih.gov
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