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Certain foods are commonly linked to psoriasis flare-ups, though evidence varies by food. Red meat and ultra-processed foods have research connecting them to inflammation, alcohol is one of the more consistently reported triggers, and gluten mainly matters for those with confirmed sensitivity. Other
The foods most commonly linked to psoriasis flare-ups are red meat, ultra-processed foods, alcohol, and — for people with confirmed sensitivity — gluten. Evidence varies by food: some connections are backed by research on inflammation, while others rely mainly on self-reported patient experience. No food causes psoriasis outright, and triggers differ from person to person, so this list works better as a starting point for personal experimentation than a universal rulebook.
Food is just one of several psoriasis triggers, alongside stress, weather, and skin injury, so diet changes are usually most useful alongside — not instead of — medical treatment.
Red meat and processed meat. Red meat contains a fatty acid called arachidonic acid, which research has linked to the production of inflammatory chemicals in the body. Medical News Today notes that a diet high in red meat may worsen inflammation in psoriasis, and avoiding it can also help lower heart disease risk — a relevant bonus, since psoriasis itself is linked to higher cardiovascular risk. Processed meats like bacon and sausage carry similar concerns, often compounded by high sodium and saturated fat content.
Ultra-processed foods. These foods are typically loaded with added sugar, refined carbohydrates, and saturated fat, while lacking the fiber that helps lower inflammation. Common examples include pre-packaged ready-to-heat meals, processed meats, and packaged baked goods. GoodRx-reviewed guidance recommends limiting or avoiding these as much as practical.
Alcohol. Alcohol is one of the more consistently reported psoriasis triggers across both patient surveys and clinical literature. It's associated with long-term inflammation, and some sources note it can interfere with certain psoriasis treatments, making moderation or avoidance a reasonable recommendation regardless of whether alcohol is a confirmed personal trigger.
Gluten — but only for some people. Gluten sensitivity appears more common in people with psoriasis than in the general population, and people with confirmed gluten sensitivity or celiac disease may see symptom improvement after removing gluten. However, this isn't a universal recommendation — dietary reviews specifically limit this advice to people who test positive for gluten sensitivity markers, not everyone with psoriasis.
Several foods show up often in psoriasis diet advice, but the evidence supporting them is thinner — usually based on self-reported surveys rather than controlled research:
Nightshade vegetables. Tomatoes, potatoes, eggplant, and peppers belong to this plant family, and some people report worsened symptoms after eating them. One self-reported survey found just over half of respondents noticed improvement after cutting nightshades, but researchers note there isn't enough evidence to draw a definitive connection. These vegetables are also nutritious, so removing them permanently without noticing a personal benefit may not be worthwhile.
Dairy products. Some sources point to arachidonic acid and the milk protein casein as potential inflammation triggers, and some individuals report worsened symptoms after consuming dairy. Evidence here is mixed and largely anecdotal rather than clinically established for the general psoriasis population.
Citrus fruits. A small number of sources suggest citrus fruits like oranges, lemons, and grapefruit could trigger flares in people who have an allergic-type sensitivity to them, though this isn't broadly documented as a common psoriasis trigger.
Excess sugar. High sugar intake is frequently grouped with processed foods as inflammatory, though it's rarely studied as an isolated trigger separate from broader processed-food patterns.
Not every food on this list affects every person with psoriasis. Some foods that trigger flares for one person — nightshades, dairy, eggs — are also nutrient-dense and perfectly fine for someone else to keep eating. Because of that, dermatology sources generally recommend a short elimination trial rather than permanent avoidance: cutting out a suspected food for two to four weeks, then reintroducing it to see whether symptoms change.
Working with a dermatologist or registered dietitian during this process helps make sure nutritional needs are still being met, especially since eliminating multiple food groups at once can make it harder to identify which change actually mattered — and can also risk nutritional gaps if not planned carefully.
Understanding what to limit is easier alongside what to add. Diets that emphasize fresh fruits and vegetables, lean proteins, low-fat dairy, whole grains, and fatty fish rich in omega-3s are generally associated with lower symptom severity, largely because they replace inflammatory choices rather than adding anything uniquely "anti-psoriasis." This overlaps closely with a heart-healthy, Mediterranean-style eating pattern.
Some people explore more restrictive approaches, like the autoimmune protocol diet or ketogenic diets, hoping to reduce inflammation further. These can work for some individuals, but they require careful planning and aren't necessary for everyone with psoriasis. Because they eliminate entire food groups, they carry a higher risk of nutritional gaps if not guided by a professional, and there isn't strong universal evidence that they outperform a more moderate, Mediterranean-style approach for most people.
Is dairy bad for psoriasis?
The evidence is mixed. Some people report worsened symptoms after eating dairy, possibly related to compounds like arachidonic acid and casein, but this isn't established as a universal trigger. An elimination trial can help determine whether dairy specifically affects your symptoms.
Do nightshade vegetables really trigger psoriasis flares?
The connection is mostly based on self-reported experience rather than strong clinical research. A notable survey found around half of respondents felt better after removing nightshades, but researchers say there isn't enough evidence to confirm this as a reliable trigger for everyone.
Should I stop eating gluten if I have psoriasis?
Only if you have confirmed gluten sensitivity or celiac disease. Dietary guidelines specifically limit the gluten-free recommendation to people who test positive for gluten sensitivity markers, rather than suggesting it broadly for everyone with psoriasis.
Does alcohol make psoriasis worse?
Yes, alcohol is one of the more consistently reported psoriasis triggers, and it's linked to long-term inflammation. It can also interfere with certain psoriasis treatments, which is an added reason to limit or avoid it beyond any direct effect on flares.
Can cutting out trigger foods replace my psoriasis medication?
No. Diet changes may help reduce symptom severity for some people, but they don't replace prescribed treatment. Any significant dietary change is best discussed with a dermatologist so it complements your existing treatment plan rather than working against it.
Red meat, ultra-processed foods, alcohol, and gluten (for those with sensitivity) have the most consistent evidence behind them as psoriasis triggers, while foods like nightshades, dairy, and citrus rely more on individual reports than solid research. Rather than eliminating everything at once, a short, structured trial — ideally guided by a dermatologist or dietitian — is the most reliable way to figure out which foods actually affect your symptoms.
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