The anti-inflammatory diet for psoriasis: a label in search of a definition, and the one version that has been tested

A label with a shape but no contents

Ask several sources what the anti-inflammatory diet for psoriasis is and you get several lists. In the versions this page was written against, they overlap in the middle, leafy greens, berries, oily fish, olive oil, nuts, turmeric, less sugar, less processed food, and diverge at the edges, where one bans nightshades, another dairy, another gluten, another adds a supplement stack. Anti-inflammatory diet is a phrase describing an intended effect, and none of the evidence cited here tested a diet under that name in psoriasis.

The phrase is not empty. Psoriasis is an immune-mediated inflammatory disease, and it is entirely reasonable to want to eat in a way that does not stoke inflammation. The clinical-practice review of nutrition in psoriasis uses the term itself, describing the Mediterranean diet as a good option for people with psoriasis given its anti-inflammatory effects and cardiovascular benefits ^[4]. The problem is not the idea. It is that the idea, unanchored, absorbs anything.

Sources for this section: [4] Nutrition and Psoriasis: The Latest Evidence and How to Approach Nutrition in Clinical Practice

What the reviews will and will not sign

The people who have gone through the psoriasis diet literature systematically are careful with this label. The National Psoriasis Foundation's medical board, across 55 studies, made a strong recommendation for weight reduction in people who are overweight, a conditional one for gluten-free eating in people with positive markers, and filed the rest, including select foods, nutrients and dietary patterns, under low-quality data that may affect psoriasis ^[2]. A 2025 systematic review found that diets meeting Mediterranean, gluten-free or calorie-restricted principles, along with fibre, probiotic, prebiotic and omega-3 intake, may be associated with better outcomes, while stating that high-quality evidence on diet and psoriasis is lacking ^[5]. A scoping review of the whole field concluded there are no specific, evidence-based dietary guidelines for psoriasis, and that the dietary approaches with evidence work only in specific populations, people with obesity and people with coeliac disease ^[8].

So the reviews will sign a pattern, weight loss where it applies, and the conditional case for gluten. A list of anti-inflammatory foods is not among the things they sign. The joint dermatology guidelines of care describe their own scope as topical agents, alternative medicine and severity assessment ^[3]; a food list is not what they are for.

Sources for this section: [2] Dietary Recommendations for Adults With Psoriasis or Psoriatic Arthritis From the Medical Board of the National Psoriasis Foundation: A Systematic Review · [3] Joint AAD-NPF guidelines of care for psoriasis · [5] Evidence-based dietary recommendations for patients with psoriasis: A systematic review · [8] The role of diet in the management of psoriasis: a scoping review

The version that has been through a trial

Take the shared middle of those lists, vegetables, fruit, legumes, whole grains, fish, olive oil, nuts, and less sugar, less processed meat, less alcohol, and you have described the Mediterranean diet as its trial protocol defines it: fruits, whole grains, vegetables, nuts, seeds, legumes and olive oil, with seafood, poultry and fermented dairy in moderation, and red and processed meat, sweets and ultra-processed foods limited ^[9]. That pattern has been tested. In a 2025 randomised clinical trial, 38 people with mild to moderate psoriasis were assigned to a 16-week dietitian-guided Mediterranean diet, with counselling, materials and weekly olive oil, or to standard low-fat advice. The diet group's severity index fell by a between-group difference of -3.4, and nine of the 19 people in it, 47.4%, reached a 75% reduction, against none in the control group ^[1].

It is one trial, it is small, and it was open-label at a single clinic; hold that. But it is a diet with the shape the label describes, tested with a control group and a clinical endpoint. The other versions of the label discussed here are that pattern with things added that were not in it, or removed that were.

Two things about the trial's diet matter for the listicle versions. It was not a nightshade-free diet; its protocol encouraged cooking with sofrito, a tomato, garlic and onion sauce, at least twice a week ^[9]. And it was not a supplement protocol; what participants were given was counselling, materials, recipes, menus and a weekly bottle of extra virgin olive oil ^[9]. An anti-inflammatory diet that bans tomatoes and adds capsules has departed from the version with evidence in both directions.

Sources for this section: [1] Mediterranean Diet and Patients With Psoriasis: The MEDIPSO Randomized Clinical Trial

What people with psoriasis are measured as eating

The observational data say where the pattern is most needed. In the UK Biobank, people with psoriasis scored slightly higher than others on a Mediterranean-style diet score, and at the same time reported more red and processed meat, more sodium, more free sugars and more alcohol; those with the most severe disease were less likely to meet the fruit and vegetable guideline, and those with a comorbidity had lower diet quality on both measures ^[7]. That is a population already part-way towards the pattern and being pulled off it at the edges the anti-inflammatory lists agree about: processed meat and sugar.

Which is the useful thing the label can do. Used as a direction rather than a rulebook, anti-inflammatory points at the right edges, less processed meat, less sugar, less alcohol, more of the vegetables and fish the trial's protocol asked for ^[9]. Used as a rulebook, it points at the tomatoes.

Sources for this section: [7] Are psoriasis severity and comorbidities associated with diet quality? A cross-sectional analysis using UK Biobank

The capsule half of the list

Most anti-inflammatory diet pages for psoriasis end with a shelf: fish oil, curcumin, vitamin D, probiotics. That half has been pooled, and the result is instructive. A 2025 network meta-analysis of twenty-one randomised trials of supplements in plaque psoriasis, 1463 patients across vitamin D, fish oil, selenium, probiotics, curcumin and micronutrients, found that vitamin D reduced the severity index, that curcumin reduced one cytokine, that no supplement dominated across outcomes, and that the certainty of the whole body of evidence was low to moderate because of heterogeneity and imprecision ^[6].

Set that beside the dietary trial. A whole pattern, eaten for sixteen weeks, moved the severity index by -3.4 with a control group to compare against ^[1]. The supplements, pooled across twenty-one trials, produced a field its own reviewers describe as uncertain and in need of larger confirmatory trials ^[6]. Of the two halves of the label, the food half is the one with a controlled result to point at. The capsule half is a conversation with a dermatologist, and the supplement-aisle essay on this site takes it shelf by shelf.

Sources for this section: [1] Mediterranean Diet and Patients With Psoriasis: The MEDIPSO Randomized Clinical Trial · [6] Effectiveness and safety of dietary supplements in the adjunctive treatment of psoriasis: a systematic review and network meta-analysis

An anti-inflammatory week built from the trial

Breakfast: eggs with capsicum and tomato; ricotta, pear and walnuts on toast; oats or polenta with fruit. Lunch: a red lentil soup; a barley, mushroom and leek bowl; a salmon and potato salad with dill yoghurt; minestrone with cannellini beans. Dinner: white fish baked in tomato, olive and caper sauce; turkey and mushroom ragù with pasta; stuffed capsicums; a lamb and apricot tagine with couscous; Greek-style baked beans. Olive oil as the fat throughout, fruit as the sweet thing, nuts as the snack, wine rarely and water mostly.

That is the free seven-day psoriasis week on this site: the Mediterranean pattern as the trial protocol describes it, with the tomatoes left in and the supplement aisle left out. It is a week of cooking, not the dietitian-guided programme the trial delivered, and it does not claim to be. If it suits you, the cookbook is the same pattern with a hundred recipes and a 28-day plan.