Psoriasis Diet: Foods That Help, Triggers and Evidence

A psoriasis diet is an eating pattern that lowers the inflammation behind psoriasis flares, and the strongest evidence supports two steps: losing weight if you are overweight, and cutting back on alcohol. The Medical Board of the National Psoriasis Foundation (Ford et al., JAMA Dermatology, 2018) strongly recommends a reduced calorie diet for overweight and obese adults with psoriasis, and it recommends a gluten-free diet only for people who test positive for gluten sensitivity markers.

At a Glance

A Mediterranean diet pattern shows the strongest evidence for reducing psoriasis severity: in a 2018 study of more than 3,500 French adults (Phan et al.), closer adherence was linked to milder disease.
Weight loss of 5 to 10% of body weight can meaningfully improve psoriasis in overweight individuals, and the National Psoriasis Foundation (2018) gives this its strongest dietary recommendation.
Alcohol, particularly beer and spirits, is consistently linked to worse psoriasis outcomes in observational studies reviewed by Brenaut and colleagues (2013).
Gluten-free diets benefit a subset of psoriasis patients with elevated anti-gliadin antibodies, according to Michaelsson and colleagues (2000) and the National Psoriasis Foundation (2018).
Omega-3 fatty acids from fish reduce inflammatory markers but show modest clinical improvement, and the National Psoriasis Foundation (2018) does not recommend fish oil capsules as a psoriasis treatment.
Diet works alongside medical care such as topicals, phototherapy and biologics, not in place of it, a point the 2018 National Psoriasis Foundation review states directly.

The Connection Between Diet and Psoriasis

Psoriasis is driven by immune dysregulation, not diet. But diet modulates the immune system, the gut microbiome, and systemic inflammation in ways that directly affect psoriasis severity. The relationship is not causative in most cases, but it is real and clinically relevant [1].

The strongest evidence links three dietary factors to psoriasis outcomes: body weight, alcohol consumption, and overall dietary pattern. Individual food sensitivities play a smaller role, but they matter to the subset of patients who have them.

Psoriasis, including plaque psoriasis (psoriasis vulgaris), guttate psoriasis and scalp psoriasis, shares the same core immune pathway: the IL-23 and IL-17 axis and TNF-alpha signaling. That pathway also overlaps with metabolic syndrome, type 2 diabetes and cardiovascular disease, which are more common in people with psoriasis. A diet that improves metabolic health therefore tends to help the skin too. For a full overview of the condition, see the psoriasis condition page.

What Is the Best Diet for Psoriasis?

The best diet for psoriasis is a calorie-appropriate Mediterranean-style pattern with little or no alcohol. No single food clears plaques, and no named "psoriasis diet" has been tested head to head against the others in large trials. What the evidence does show is that weight loss, lower alcohol intake and a whole-food eating pattern each reduce disease severity on their own.

The National Psoriasis Foundation review by Ford and colleagues (2018) looked at 55 studies including 4,534 people with psoriasis. Its conclusion was that dietary changes should supplement standard treatment, never replace it, and that the evidence for most individual foods and supplements is low quality. You can read the National Psoriasis Foundation dietary recommendations on PubMed.

Dietary approach	What the evidence shows	Who it suits
Reduced calorie diet for weight loss	Strong: randomized trials and a strong National Psoriasis Foundation recommendation (2018)	Adults with psoriasis who are overweight or obese
Mediterranean diet	Moderate: large observational study (Phan et al., 2018) and plausible mechanisms	Most adults with psoriasis
Alcohol reduction	Moderate: consistent observational links to severity (Brenaut et al., 2013)	Anyone who drinks, especially people on methotrexate
Gluten-free diet	Weak overall, useful only with positive gluten antibodies (Michaelsson et al., 2000)	People with celiac disease or anti-gliadin antibodies
Nightshade elimination	Very limited: self-reported survey data only (Afifi et al., 2017)	People who notice a personal pattern and want to test it

Weight and Psoriasis: The Most Impactful Dietary Factor

Obesity is an independent risk factor for developing psoriasis and for increased disease severity. Adipose tissue is metabolically active, producing pro-inflammatory cytokines (TNF-alpha, IL-6) that amplify the same pathways driving psoriatic inflammation [2].

The evidence for weight loss improving psoriasis is strong:

A randomized controlled trial of 303 overweight or obese patients in Italy (Naldi et al., British Journal of Dermatology, 2014) found that a 20-week diet and exercise program produced a median PASI reduction of 48%, compared with 25.5% in patients who received advice only.
Jensen and colleagues (2016) reported in JAMA Dermatology that weight loss decreased the severity of psoriasis in a randomized study [3].
Patients who lost more weight showed greater improvement, with a dose-response relationship
Biologic therapies work better in patients at healthy body weight. Obesity reduces the efficacy of TNF inhibitors and IL-17 inhibitors, likely through volume-of-distribution effects and increased inflammatory burden [4]

If you have psoriasis and are overweight, weight loss is the single most impactful dietary intervention available. The method matters less than the outcome: caloric restriction, intermittent fasting, low-carb, or Mediterranean patterns all produce comparable weight loss when adherence is equivalent.

A Cochrane review of lifestyle changes for psoriasis (Ko et al., 2019) reached a similar view: a low calorie diet probably reduces psoriasis severity in people with obesity, though the trials were small. The Cochrane review of lifestyle changes for treating psoriasis is free to read. Some people now combine diet with GLP-1 medicines for weight loss; the role of GLP-1 drugs in inflammation is still being studied.

The Mediterranean Diet: Best Evidence Base

The Mediterranean dietary pattern has the most supporting evidence for psoriasis management. A 2018 cross-sectional study of over 3,500 psoriasis patients found that higher adherence to a Mediterranean diet was associated with lower PASI scores, independent of BMI and other confounders [5].

Key components:

Foods to Emphasize

Fatty fish (salmon, sardines, mackerel): 2-3 servings/week. Rich in EPA and DHA, which compete with arachidonic acid in inflammatory pathways
Extra virgin olive oil: Primary fat source. Contains oleocanthal, a natural anti-inflammatory compound
Vegetables and fruits: 5-9 servings daily. Focus on dark leafy greens, cruciferous vegetables, and berries for polyphenol content
Nuts and seeds: Daily. Walnuts and flaxseeds provide alpha-linolenic acid (ALA). Almonds and pistachios provide vitamin E
Whole grains: Oats, quinoa, brown rice. Provide fiber that supports gut microbiome diversity
Legumes: Lentils, chickpeas, black beans. High fiber, plant protein, and resistant starch
Herbs and spices: Turmeric (curcumin), ginger, rosemary, oregano. All have demonstrated anti-inflammatory activity in laboratory studies

Why It Works

The Mediterranean diet reduces systemic inflammation through multiple pathways: increased omega-3 to omega-6 ratio, polyphenol-mediated NF-kB suppression, improved insulin sensitivity (reducing metabolic inflammation), and positive shifts in gut microbiome composition [6]. These are the same inflammatory pathways that drive psoriatic disease.

Is an Anti-Inflammatory Diet the Same Thing?

"Anti-inflammatory diet" is a looser label for the same idea: more fish, vegetables, olive oil and fiber, and fewer refined carbohydrates, processed meats and sugary drinks. The Mediterranean diet is the version with the most research behind it. Stricter plans such as the autoimmune protocol (AIP) diet have little psoriasis-specific evidence and are harder to keep up.

Foods That Trigger Flares

Alcohol

Alcohol is the most consistently identified dietary trigger for psoriasis flares. Multiple observational studies confirm the association [7]:

Alcohol increases intestinal permeability (“leaky gut”), allowing bacterial endotoxins to enter the bloodstream and activate immune cells
It promotes Th1 and Th17 immune polarization, the same pathways driving psoriasis
Beer contains gluten, which may compound the effect in gluten-sensitive individuals
Alcohol impairs liver function, reducing clearance of inflammatory mediators
Heavy drinking (more than 80 g/day) is associated with 2-3x increased psoriasis severity

Complete abstinence produces the clearest benefit, but even reducing intake to fewer than 2 drinks per week shows measurable improvement in some patients.

Alcohol matters even more for people taking methotrexate or acitretin, two oral psoriasis medicines with liver-related cautions. Methotrexate prescribing guidance advises limiting or avoiding alcohol because both stress the liver, so ask your dermatologist what is safe with your regimen.

Processed and Ultra-Processed Foods

Foods high in refined sugars, trans fats, and artificial additives promote systemic inflammation through multiple mechanisms: AGE (advanced glycation end-product) formation, oxidative stress, and adverse gut microbiome shifts. While no single processed food has been identified as a psoriasis trigger, dietary patterns high in processed foods are associated with worse psoriasis outcomes in observational studies [8].

Red and Processed Meat

High intake of red meat, particularly processed varieties (bacon, sausage, deli meats), provides arachidonic acid, a precursor to pro-inflammatory prostaglandins and leukotrienes. Reducing red meat to 1-2 servings per week and eliminating processed meat is a reasonable strategy, though the evidence is less strong than for alcohol or weight management.

Nightshades

Tomatoes, peppers, eggplant, and potatoes are frequently cited in anecdotal reports as psoriasis triggers. The proposed mechanism involves solanine and related alkaloids, which may increase intestinal permeability in susceptible individuals. The scientific evidence for this is limited. A 2017 survey-based study found that 52% of psoriasis patients who tried eliminating nightshades reported improvement, but this was self-reported and uncontrolled [9].

If you suspect nightshades are a trigger, a 30-day elimination followed by systematic reintroduction is the most practical way to test it.

Dairy and Sugar

Dairy and added sugar are two other foods people often cut first, but neither has trial evidence as a psoriasis trigger. In the US national survey of 1,206 psoriasis patients by Afifi and colleagues (2017), the changes most often linked to self-reported improvement were reducing alcohol (53.8%), gluten (53.4%) and nightshades (52.1%), not cutting dairy or sugar. Added sugar is still worth limiting for metabolic reasons. Dairy is a personal question best settled with a structured elimination and reintroduction.

Psoriasis Diet Food List: What to Eat and What to Limit

The psoriasis diet food list below summarizes the foods covered above. It is a starting framework drawn from the Mediterranean pattern and the National Psoriasis Foundation review, not a strict rulebook, and personal triggers vary.

Eat more often	Limit or test
Fatty fish such as salmon, sardines and mackerel	Alcohol, especially beer and spirits
Extra virgin olive oil as the main cooking fat	Processed meat such as bacon, sausage and deli meats
Vegetables, leafy greens, berries and other fruit	Sugary drinks, sweets and refined white flour products
Legumes such as lentils, chickpeas and black beans	Ultra-processed snacks and fried fast food
Whole grains such as oats, quinoa and brown rice	Gluten, only if you test positive for gluten antibodies
Nuts, seeds, herbs and spices such as turmeric and ginger	Nightshades or dairy, only if a structured trial shows a pattern

Gluten and Psoriasis

The relationship between gluten and psoriasis is more nuanced than popular advice suggests. Not all psoriasis patients benefit from going gluten-free. The evidence points to a specific subgroup:

Approximately 14-25% of psoriasis patients have elevated anti-gliadin antibodies (AGA), even without celiac disease [10]
In AGA-positive patients, a gluten-free diet has been shown to improve PASI scores in small controlled studies
In AGA-negative patients, gluten-free diets show no consistent benefit

The practical approach: get tested for anti-gliadin antibodies. If positive, a 3-month trial of strict gluten elimination is warranted. If negative, there is no strong reason to avoid gluten specifically.

People with psoriasis also have a higher rate of celiac disease, which is diagnosed with tissue transglutaminase (tTG-IgA) blood tests and confirmed by biopsy. Test before you cut gluten, because a gluten-free diet can make celiac testing unreliable. The difference between the two conditions is covered in celiac disease versus gluten sensitivity.

Supplements With Evidence

Omega-3 Fatty Acids

A meta-analysis of 12 RCTs found that fish oil supplementation (1-3 g EPA+DHA daily) produced a small but statistically significant improvement in psoriasis severity. The effect is modest and works best as adjunct therapy rather than standalone treatment. Clinical response typically takes 8-12 weeks of consistent supplementation.

Expert bodies read this evidence more cautiously. The National Psoriasis Foundation medical board (Ford et al., 2018) did not recommend oral fish oil as a psoriasis treatment, because it was not effective at the doses and durations studied. Eating fatty fish is still a sound part of the Mediterranean pattern, and dosing questions are covered in omega-3 dosing.

Vitamin D

Vitamin D deficiency is more prevalent in psoriasis patients than the general population. Supplementation to normalize levels (target 40-60 ng/mL) is reasonable, though evidence that supplementation alone improves psoriasis is mixed. Topical vitamin D analogs (calcipotriol) are a mainstay of treatment, but oral supplementation addresses the systemic deficiency rather than local skin effects.

The National Psoriasis Foundation review (2018) did not recommend vitamin D supplements for psoriasis in people with normal levels, and gave a weak recommendation for vitamin D in psoriatic arthritis. A blood test for 25-hydroxyvitamin D tells you which group you are in; see vitamin D optimization for how testing works.

Probiotics

The gut-skin axis is an active area of psoriasis research. Psoriasis patients show reduced gut microbiome diversity, with lower levels of Akkermansia and Faecalibacterium. Probiotic supplementation studies are preliminary but a 2019 pilot trial showed improvement in PASI scores with a multi-strain probiotic over 12 weeks. More data is needed before specific strains can be recommended.

Curcumin (Turmeric)

Curcumin inhibits NF-kB, a central transcription factor in psoriatic inflammation. A 2016 RCT found that oral curcumin (2 g/day) combined with topical steroids was superior to topical steroids alone. Bioavailability is a challenge; formulations with piperine or lipid encapsulation improve absorption.

Supplements are not regulated like prescription drugs. The FDA does not review dietary supplements for effectiveness before they are sold, so quality varies between products. Tell your dermatologist what you take, since some supplements interact with immunosuppressive medicines.

Building Your Psoriasis Diet Plan

A practical framework based on the evidence:

Foundation: Mediterranean-pattern eating with emphasis on fish, vegetables, olive oil, and whole grains
Eliminate: Alcohol (or reduce to minimal), processed foods, excess sugar
Test: If suspecting specific triggers (gluten, nightshades, dairy), do a structured 30-day elimination with reintroduction
Supplement: Omega-3 (2-3 g/day), vitamin D (if deficient), probiotic (multi-strain)
Weight: If overweight, target 5-10% body weight loss through whatever sustainable method works for you
Track: Keep a food diary alongside a flare diary for 8-12 weeks to identify personal patterns

Change one thing at a time where you can. Psoriasis flares also follow stress, infections such as strep throat, skin injury, cold dry weather and medication changes, so a food diary is most useful when it records those events too. Bring the diary to your next appointment so your clinician can see patterns alongside your treatment history.

Who Can Help With a Psoriasis Diet?

A board-certified dermatologist manages psoriasis treatment, and a registered dietitian (RD) can turn the evidence above into a meal plan you can keep up. A rheumatologist joins the team when joint pain suggests psoriatic arthritis, which affects many people with psoriasis. Some people also see integrative or functional medicine clinicians for nutrition-focused care, though the dietary evidence is the same wherever you go.

Diet sits alongside the main treatments: topical steroids and vitamin D analogs, phototherapy (narrowband UVB), oral systemic drugs such as methotrexate and apremilast, and biologics that target TNF-alpha, IL-17 and IL-23. The psoriasis treatment guide explains how these options compare, and how psoriasis biologics work covers the injectable medicines in more depth.

To find providers near you, browse clinics offering psoriasis treatment across the US. Listing order there is not paid ranking, Featured slots are labeled and capped, Verified means credential checks rather than spend, and the directory is free for patients. Inclusion in the directory is not an endorsement, so ask any clinic how it combines nutrition advice with standard dermatology care. The guide to Featured, Verified and organic listings explains each label.

Frequently asked questions

What foods should you avoid with psoriasis?

The foods most worth limiting with psoriasis are alcohol, processed meat, sugary drinks and heavily processed snacks. Alcohol has the most consistent link to worse disease in observational studies reviewed by Brenaut and colleagues (2013). Gluten only needs to go if a blood test shows celiac disease or anti-gliadin antibodies. Nightshades and dairy have no controlled trial evidence, so test them with a 30-day elimination and reintroduction rather than cutting them by default.

Can diet alone clear psoriasis?

Diet alone does not clear psoriasis for most people, because the condition is driven by the immune system. Diet can lower severity, especially through weight loss: in the Naldi trial (2014), overweight patients on a diet and exercise program saw a median 48% drop in PASI score versus 25.5% with advice only. The National Psoriasis Foundation (2018) says dietary changes should supplement standard treatment such as topicals, phototherapy or biologics, not replace it.

Is the Mediterranean diet good for psoriasis?

The Mediterranean diet is the eating pattern with the strongest evidence for psoriasis. Phan and colleagues (JAMA Dermatology, 2018) found that among more than 3,500 people with psoriasis, closer adherence to a Mediterranean diet was linked to milder disease, independent of body weight. The pattern centers on fish, olive oil, vegetables, legumes, nuts and whole grains, and it also supports heart and metabolic health, which matters because psoriasis raises cardiovascular risk.

Should I go gluten-free if I have psoriasis?

Go gluten-free for psoriasis only if testing shows celiac disease or anti-gliadin antibodies. The National Psoriasis Foundation (2018) weakly recommends a gluten-free diet for this group, and Michaelsson and colleagues (2000) found that antibody-positive patients improved on it. People who test negative show no consistent benefit. Get tested before cutting gluten, because removing it first can make celiac test results unreliable.

How long does it take for diet changes to help psoriasis?

Diet changes usually take two to five months to show in the skin. The weight loss trial by Naldi and colleagues (2014) measured results at 20 weeks, and fish oil studies typically report changes after 8 to 12 weeks. A gluten-free trial for antibody-positive patients is usually run for three months. Keeping a food and flare diary over that period makes it easier to judge whether a change is helping.

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Jensen P, Skov L, Zachariae C. Weight loss decreases the severity of psoriasis: a randomized clinical study. JAMA Dermatol. 2016;152(4):504-506. doi:10.1001/jamadermatol.2015.5783 ↩
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