Popular Conditions & Diets
Psoriasis has a frustrating habit of showing up when the body is already dealing with something else.
Stress is a well-established trigger, but it's far from the only one. Hormonal changes, infections, medications, skin injuries, smoking, alcohol, heck, even cold, dry weather can contribute to flare-ups. Sometimes, there's no obvious trigger at all.
I learned some of this through experience. My first psoriasis flare appeared about two years ago, primarily on the palms of my hands, during a period of significant stress. Since then, keeping it under control has been an ongoing process of paying attention to what makes it better, what makes it worse, and what may have nothing to do with it despite claims scattered across the internet.
Food inevitably enters that conversation.
If you've ever searched for information about psoriasis and nutrition, you've likely encounter recommendations to eliminate gluten, dairy, sugar, nightshades, alcohol, and processed foods, alongside supplements and highly specific anti-inflammatory diets. The implication is often that if you can just figure out the right foods, you can fix the problem.
Psoriasis, unfortunately, isn't that simple.
It is a chronic, immune-mediated inflammatory disease with genetic, environmental, and physiological influences. There is currently no diet that can cure psoriasis. But that doesn't mean nutrition is irrelevant. Researchers are increasingly investigating how dietary patterns, metabolic health, nutrient status, and the gut microbiome may interact with the inflammation underlying psoriasis.
And some of the emerging evidence is genuinely interesting.
Psoriasis develops when an overactive immune response accelerates the normal life cycle of skin cells. Instead of turning over gradually, skin cells accumulate rapidly, contributing to the raised, inflamed, and often scaly patches associated with the condition.
Behind that visible reaction is a complex network of inflammatory signalling. The IL-23/IL-17 immune pathway plays a central role in psoriasis, contributing to both inflammation and the rapid growth of skin cells characteristic of the condition.
Genetics influence who develops the disease, but genes don't tell the whole story.
The American Academy of Dermatology identifies several potential psoriasis triggers, including stress, infections, skin injuries, certain medications, smoking, alcohol, and cold or dry weather. What triggers one person's psoriasis may have little effect on another.
Stress is particularly complicated.
Psychological stress activates systems involved in hormone production, inflammation, and immune regulation. Research has long supported an association between stress and psoriasis, although the biological mechanisms connecting the two are still being investigated.
It can also become a feedback loop: stress may contribute to a flare, while living with painful, itchy, or highly visible psoriasis can itself create more stress.
Hormones may play a role, too. Research examining psoriasis across different stages of women's lives suggests symptoms can change during menstruation, pregnancy, the postpartum period, and menopause. Some people improve during pregnancy and experience a flare after giving birth, for example, although these patterns aren't universal.
Add environmental exposures, illness, medications, skin irritation, and lifestyle factors, and it becomes easier to understand why identifying a single cause for a flare can be difficult.
So, where does food fit?
One reason nutrition has become an important area of psoriasis research is that psoriasis doesn't exist solely on the surface of the skin.
It's associated with systemic inflammation and an increased prevalence of several other health conditions, including cardiovascular disease, metabolic syndrome, insulin resistance, and psoriatic arthritis.
That has pushed researchers to look beyond individual "good" or "bad" foods and investigate broader dietary patterns.
One of the most interesting is the Mediterranean diet.
Rather than eliminating long lists of foods, Mediterranean-style eating emphasizes vegetables, fruit, legumes, whole grains, nuts and seeds, olive oil, fish, and other minimally processed foods. It tends to provide plenty of fibre, unsaturated fats, antioxidants, and other compounds involved in metabolic and cardiovascular health.
And in 2025, researchers put it to the test specifically for psoriasis.
The MEDIPSO randomized clinical trial, published in JAMA Dermatology, followed adults with mild-to-moderate psoriasis who were already receiving stable topical treatment. One group participated in a 16-week Mediterranean diet intervention led by a dietitian, while the control group received standard low-fat dietary advice. The difference was notable.
Approximately 68 per cent of participants following the Mediterranean diet achieved at least a 50 per cent reduction in their Psoriasis Area and Severity Index (PASI), compared with approximately 11 per cent of the control group.
That's an intriguing result, particularly because randomized dietary trials investigating psoriasis are relatively uncommon.
But it isn't proof that Mediterranean eating treats psoriasis.
The study included only 38 participants, and those in the Mediterranean diet group received considerably more dietary support. Larger and longer studies will be needed to determine how reproducible the results are and which components of the diet may be responsible.
For now, the research gives us a promising direction rather than a prescription.
Individual nutrients have also attracted attention.
Omega-3 fatty acids, found in foods such as salmon, sardines, mackerel, walnuts, flaxseed, and chia seeds, are involved in pathways that regulate inflammation. That makes them an obvious candidate for psoriasis research.
However, studies investigating omega-3 supplementation have produced mixed results. Eating omega-3-rich foods can still form part of an overall healthy dietary pattern, particularly given their cardiovascular benefits, but fish oil shouldn't be treated as a proven psoriasis therapy.
Vitamin D presents another interesting case.
Vitamin D plays roles in immune function and skin cell growth, and topical vitamin D analogues are already established psoriasis treatments. That has understandably led to questions about taking vitamin D orally.
The distinction matters: applying a vitamin D analogue to affected skin is not the same intervention as taking a vitamin D supplement.
Studies have found associations between vitamin D status and psoriasis, but evidence that supplementation reliably improves symptoms remains inconsistent. Someone who is deficient may need supplementation, but taking increasingly high doses isn't a shortcut to clearer skin.
And then, there's the gut.
Research into the gut microbiome has exploded in recent years, and psoriasis is part of that conversation. Scientists have identified differences between the gut microbial communities of some people with psoriasis and those without the disease.
That doesn't mean we've discovered a "root cause."
The gut microbiome interacts with immune function, and diet is one of many factors that shapes it. Fibre-rich foods such as vegetables, fruit, legumes, nuts, seeds, and whole grains support microbial diversity and the production of compounds such as short-chain fatty acids.
Those foods make sense as part of a nutritious eating pattern. Claims that psoriasis can be cured by "healing the gut," however, move considerably beyond what current evidence can support.
This is where psoriasis nutrition advice can become unnecessarily restrictive.
Gluten, dairy, tomatoes, peppers, potatoes, sugar, eggs, red meat, and numerous other foods have all been blamed for psoriasis symptoms online.
The evidence doesn't support universally eliminating them.
Gluten is a good example. Psoriasis and celiac disease appear to occur together more frequently than would be expected by chance, and National Psoriasis Foundation dietary recommendations have supported a trial of a gluten-free diet in people with psoriasis who have evidence of gluten sensitivity.
That is very different from recommending that everyone with psoriasis stop eating gluten.
Evidence supporting routine elimination of dairy or nightshade vegetables is even weaker.
That doesn't mean individual experiences should be dismissed. Someone may genuinely notice that a particular food or eating pattern coincides with symptoms. But repeatedly removing foods without a clear reason can make eating unnecessarily restrictive while making it harder to determine what, if anything, is actually affecting the skin.
If food seems to be a trigger, tracking symptoms and discussing a structured elimination and reintroduction process with a registered dietitian or healthcare provider can provide much more useful information.
Perhaps the biggest shift in thinking about psoriasis and nutrition is moving away from the search for a miracle food or perfect elimination diet.
The evidence increasingly points toward overall dietary patterns.
A Mediterranean-style approach offers a practical starting point: plenty of vegetables and fruit, legumes, nuts and seeds, whole grains, olive oil and other unsaturated fats, and regular sources of omega-3s.
For people who are overweight or living with obesity, weight management may also be relevant. Research used to develop National Psoriasis Foundation dietary recommendations found evidence that weight reduction can improve psoriasis severity in some people with overweight or obesity.
That needs context, though. Psoriasis occurs across body sizes, and weight loss is not a prerequisite for managing it.
Nutrition is also only one piece of a much bigger puzzle.
Medical treatment remains important. So do sleep, stress management, avoiding smoking, moderating alcohol intake, and protecting affected skin from irritation. Someone whose psoriasis primarily affects their hands may also need to consider repeated handwashing, cleaning products, occupational exposures, friction, and other things the skin encounters every day.
Tracking flare-ups can sometimes reveal patterns that are difficult to spot in the moment. Rather than recording food alone, consider stress, sleep, illness, menstrual cycle changes, medications, weather, alcohol, and skin exposures alongside symptoms.
And if psoriasis suddenly worsens, becomes painful, doesn't respond to usual treatment, or is accompanied by joint pain, swelling, or prolonged morning stiffness, it's worth talking to a healthcare provider.
Food probably isn't going to "heal" psoriasis.
But that's not the same as saying nutrition doesn't matter.
For a disease driven by inflammation and associated with broader metabolic and cardiovascular health, eating well may be one useful way to support the body alongside appropriate treatment. The emerging research suggests there is more to learn about that relationship.
For those of us dealing with psoriasis, that feels much more useful than another list of foods we're told never to eat again.
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