Partly. Of everything sold as a psoriasis anti-inflammatory diet, the change with the best proof is losing weight if you carry extra: across 13 randomized trials, weight-loss programs lowered psoriasis scores. A small 2025 trial found a Mediterranean diet helped too. Fish oil on its own did nothing in pooled trials, and going gluten-free is only advised for people with positive blood tests.
How we picked the studies
Search "psoriasis anti-inflammatory diet" and you get lists. Cut dairy, cut gluten, cut nightshades, eat more fish and olive oil. The lists rarely say where the advice came from, so we went and looked.
We pulled 12 peer-reviewed papers and sorted them by study design, strongest first. A randomized trial assigns people to a diet or a control group by chance, so the groups start out alike. A pooled analysis, also called a meta-analysis, adds several trials together into one estimate. A cohort study watches what people already eat and looks for patterns. It can show a link, nothing more. Expert reviews sit on top: panels that read all of it and vote on advice.
The largest expert review, from the National Psoriasis Foundation's medical board in 2018, covered 55 studies with 4,534 people who had psoriasis. Its advice is our baseline. Where a newer trial moved the picture, we say so.
The strongest evidence: weight loss
In 2026, a research team pooled 13 randomized trials of weight-loss programs in 1,145 adults with psoriasis. Most programs changed what people ate, and three used weight-loss medicines. People on a program lost 6.7 kg more than the control groups, on average.
Weight loss holds up on 13 trials. The Mediterranean diet holds up on one. Fish oil alone does not.From a 2026 meta-analysis in J Eur Acad Dermatol Venereol
Their skin improved with it. The PASI, the score doctors use to rate psoriasis (higher is worse), fell 2.5 points more in the weight-loss groups. In six comparisons covering 681 people, those on a program were 1.6 times as likely to reach PASI 75, which means a 75% drop from their starting score. The authors called this high-certainty evidence and said weight loss should be part of routine treatment.
Older work points the same way. A 2019 pooling of six randomized trials found PASI fell 2.59 points more with diet or activity programs than with control. A Cochrane review the same year found that in two trials of 323 obese people, a low-calorie diet made PASI 75 1.66 times as likely, though it graded that evidence low quality.
One limit matters. Every one of these trials enrolled people with obesity, and Cochrane said plainly that nobody has yet tested whether diet helps people with psoriasis who are not obese. People in the trials also knew which group they were in. The foundation's advice draws the same line: it strongly recommends weight loss on a lower-calorie diet, but only for overweight and obese patients. That covers a lot of people: four in five with psoriasis also live with overweight or obesity.
Does the Mediterranean diet work as a psoriasis anti-inflammatory diet?
Here the evidence gets thinner, but it just got its first real trial. MEDIPSO, published in 2025, randomized 38 adults with mild to moderate psoriasis who were already on stable skin creams. Nineteen got 16 weeks of a dietitian-guided Mediterranean diet, with coaching and a weekly supply of extra virgin olive oil. The other 19 got standard low-fat advice and no dietitian.
The diet group's PASI fell 3.4 points. The control group's did not move. Nine of the 19 people on the diet reached PASI 75, against none of the controls. Their HbA1c, a three-month blood sugar marker, fell as well.
So why not grade this Strong? Thirty-eight people, one clinic in Madrid, and the people in it knew which diet they were on. A single small trial is a clue. We would want a second one before calling it settled.
The cohort data are softer. In the French NutriNet-Santé study, 3,557 of the 35,735 people surveyed said they had psoriasis, 878 of them severe. Those in the middle band for Mediterranean eating had 29% lower odds of severe psoriasis than the lowest band, while the top band's result was weaker and its error range crossed the line of no effect. That is a link, and the authors said it needs confirming.
A 2025 UK Biobank analysis of 2,613 people with psoriasis found no difference in diet quality by how severe the disease was, so the cohorts do not even agree with each other.
The weaker evidence: fish oil, gluten and the food lists
The fish oil trials disagree. A 2020 review pooled 18 randomized trials with 927 people. Taken alone, fish oil or omega-3s did nothing to the PASI, to lesion area or to itch. Added to standard treatment, the same supplements came with a PASI 3.92 points lower. A separate 2019 pooling found 13 trials with 625 people, could only combine three of them, and found no change in PASI at all. Its authors concluded the evidence does not support fish oil for treating psoriasis.
Our reading: when a supplement only moves the needle alongside a drug, the drug is probably doing most of the work. That is a judgment, not a finding, and we flag it as one.
Gluten is a narrower story than the internet suggests. People with psoriasis have a higher rate of celiac disease than the general population, and the two conditions appear to share some genetic and inflammatory pathways. So the foundation weakly advises a gluten-free diet, but only for patients who test positive for blood markers of gluten sensitivity. A 2021 review of 42 papers on gluten and the skin listed psoriasis among the conditions that may respond to going gluten-free, and noted that skin signs in people without celiac disease vary and are often not specific. The word "may" is doing a lot of work there.
And the food lists? A 2025 review repeats the usual suspects, alcohol, dairy, sugar and gluten, then admits in the same abstract that high-quality evidence on diet and psoriasis is lacking. The foundation's own verdict on single foods and nutrients: the data behind them are low quality. That is the honest state of the folklore.
What holds up
We counted the studies in our pack by design and by what they found.
| Diet change | Best design we found | Studies (people) | What happened to psoriasis severity | Source |
|---|---|---|---|---|
| Weight loss (lower-calorie diet, some with exercise or medicine) | Pooled randomized trials | 13 trials (1,145) | Lowered. PASI 2.5 points lower, PASI 75 1.6 times as likely. | |
| Weight loss (diet or activity) | Pooled randomized trials | 6 trials | Lowered. PASI 2.59 points lower. | |
| Low-calorie diet in obese people | Cochrane review of randomized trials | 2 trials (323) | Lowered. PASI 75 1.66 times as likely, low-quality evidence. | |
| Mediterranean diet | One randomized trial | 1 trial (38) | Lowered. PASI 3.4 points lower, 9 of 19 reached PASI 75. | |
| Mediterranean diet | Cohort survey | 35,735 answered (3,557 with psoriasis) | Linked to lower odds of severe psoriasis. | |
| Diet quality | Cohort analysis | 2,613 with psoriasis | No difference by severity. | |
| Fish oil alone | Pooled randomized trials | 18 trials (927) | No change. | |
| Fish oil added to standard treatment | Same review, subgroup | Subset of 18 trials | Lowered. PASI 3.92 points lower. | |
| Fish oil | Pooled randomized trials | 3 pooled of 13 (337 of 625) | No change. | |
| Gluten-free diet | Expert review | 55 studies (4,534 with psoriasis) | Weak advice, only with positive gluten-sensitivity tests. |
The tally: five randomized results found a lower score (weight loss, the Mediterranean trial, and fish oil used alongside treatment), two found no change (both fish oil alone), and the two cohorts disagree.
So the verdict sorts itself. Weight loss, if you carry extra weight, holds up on 13 trials. The Mediterranean diet holds up on one. Fish oil as a stand-alone fix does not. Gluten-free belongs to people with a positive test. And the long lists of foods to avoid rest on data the foundation itself rated low quality.
What this means for you
Tick what you'll try this week. Your picks stay on this device.
you have psoriatic arthritis, diabetes or kidney disease; you take a systemic or biologic psoriasis medicine; you are pregnant or breastfeeding; you have a history of disordered eating; or you are thinking about a weight-loss medicine.
One tap. Results appear once 50 readers have voted, and the count is always real.
Common questions
Does psoriasis mean inflammation inside the body?
Psoriasis is a chronic inflammatory skin disease, and it has been linked to metabolic syndrome, type 2 diabetes and heart disease. Extra weight raises both the odds of getting psoriasis and the odds of severe disease. The studies here measured skin scores, so they cannot say how much diet changes whole-body inflammation.
Does an anti-inflammatory diet replace psoriasis medicines?
No. In the fish oil trials, a lower skin score only showed up when the supplement was added to standard treatment. MEDIPSO participants stayed on their usual skin creams for all 16 weeks. The foundation says diet changes should always be used together with standard medical therapy. Keep taking what you were prescribed.
What foods should I avoid with psoriasis?
The lists you see most often name alcohol, dairy, high-sugar foods and gluten, and the 2025 review that repeats them also says high-quality evidence is lacking. In UK Biobank, people with psoriasis ate more red and processed meat, salt, free sugars and alcohol than people without it, but that is a pattern, not proof those foods make skin worse.
How much weight loss makes a difference?
In the 2026 pooled analysis, programs that produced an average 6.7 kg of extra weight loss lowered PASI by 2.5 points, and where people lost about 7.3 kg more, PASI 75 became 1.6 times as likely. In Cochrane's pooled trials, body mass index fell 4.65 points. Think a steady few months, not a crash.
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How this article was made
Researched and written from 12 peer-reviewed papers. Our automated check matched every claim against the exact words of its source, confirmed every paper exists in PubMed, and found none retracted. Checked November 3, 2026. Not individually reviewed by a doctor. Photos are illustrative; the people in them are not patients or readers.
Grades run Strong, Moderate, Emerging, Early and Not supported, and the grade decides the words we may use. How we grade evidence · Medical disclaimer
Sources
- Systematic reviewDietary Recommendations for Adults With Psoriasis or Psoriatic Arthritis From the Medical Board of the National Psoriasis Foundation: A Systematic Review.Ford AR, Siegel M, Bagel J et al. JAMA Dermatol, 2018.PubMedFull paper
- Meta-analysisImpact of weight-loss interventions on psoriasis severity: A systematic review and meta-analysis.Morrow S, Hawkins P, Griffiths CEM et al. J Eur Acad Dermatol Venereol, 2026.PubMedFull paper
- Meta-analysisDoes weight loss reduce the severity and incidence of psoriasis or psoriatic arthritis? A Critically Appraised Topic.Mahil SK, McSweeney SM, Kloczko E et al. Br J Dermatol, 2019.PubMedFull paper
- Randomized trialMediterranean Diet and Patients With Psoriasis: The MEDIPSO Randomized Clinical Trial.Perez-Bootello J, Berna-Rico E, Abbad-Jaime de Aragon C et al. JAMA Dermatol, 2025.PubMedFull paper
- CohortAssociation Between Mediterranean Anti-inflammatory Dietary Profile and Severity of Psoriasis: Results From the NutriNet-Santé Cohort.Phan C, Touvier M, Kesse-Guyot E et al. JAMA Dermatol, 2018.PubMedFull paper
- Meta-analysisEfficacy of fish oil and its components in the management of psoriasis: a systematic review of 18 randomized controlled trials.Chen X, Hong S, Sun X et al. Nutr Rev, 2020.PubMedFull paper
- Meta-analysisEffects of fish oil supplement on psoriasis: a meta-analysis of randomized controlled trials.Yang SJ, Chi CC BMC Complement Altern Med, 2019.PubMedFull paper
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- Meta-analysisDiet and psoriasis, part II: celiac disease and role of a gluten-free diet.Bhatia BK, Millsop JW, Debbaneh M et al. J Am Acad Dermatol, 2014.PubMedFull paper
- Systematic reviewLifestyle changes for treating psoriasis.Ko SH, Chi CC, Yeh ML et al. Cochrane Database Syst Rev, 2019.PubMedFull paper
- Systematic reviewEvidence-based dietary recommendations for patients with psoriasis: A systematic review.Wang Q, Wang J, Sun X et al. Clin Nutr, 2025.PubMedFull paper
- CohortAre psoriasis severity and comorbidities associated with diet quality? A cross-sectional analysis using UK Biobank.Xu Y, Zanesco S, Zhang R et al. Clin Nutr, 2025.PubMedFull paper
