psoriasis diet considerations

Overview

Psoriasis is a chronic (long-lasting) skin condition where the immune system becomes overactive and speeds up the life cycle of skin cells. This causes cells to build up quickly on the surface, forming thick, scaly patches that may itch, flake, or hurt.

Yes. Psoriasis affects about 2–3% of people worldwide and is one of the most common chronic skin conditions.

Psoriasis can start at any age, but it most often appears between the ages of 15 and 35. It affects men and women equally and tends to run in families.

Symptoms

Common symptoms

• Thick, red patches of skin covered with silvery-white scales (plaques)
• Dry, cracked or bleeding skin
• Itching, burning or soreness
• Scalp build-up that looks like severe dandruff
• Changes in fingernails or toenails – pits, ridges, thickening or lifting
• Soreness or pain in affected areas

Symptoms in children

• Patches are often smaller, thinner and less scaly than in adults.
• Flare-ups often appear on the scalp, around the mouth, and in the nappy area.
• A sudden, widespread, small-dot rash can develop after a throat infection – this is called guttate psoriasis.

Symptoms in older adults

• Thinning skin makes psoriatic patches more fragile and prone to cracking.
• Itching may be more bothersome, and skin may take longer to heal.
• Joint pain from psoriatic arthritis is more common in this age group.

Causes

Main causes

• The exact cause is unknown, but psoriasis happens when the immune system mistakenly triggers inflammation and makes skin cells grow too quickly.
• Certain genes make some people more likely to develop psoriasis.
• A trigger can 'turn on' psoriasis in someone who has inherited the tendency. Common triggers include infections, skin injury, stress, smoking, and some medicines.
• Diet-related factors, such as being overweight and drinking too much alcohol, can also worsen symptoms or make flare-ups more likely.

Risk factors

• Family history of psoriasis or psoriatic arthritis
• Being overweight or obese
• Cigarette smoking and heavy alcohol intake
• Chronic stress
• Recurrent throat infections (especially streptococcal – 'strep' infections)
• A weakened immune system, for example from HIV or certain treatments

When to see a doctor

See a doctor urgently if:

• If you develop painful, red, swollen joints together with psoriasis – this may be psoriatic arthritis
• If you think your skin is infected – extensive oozing, crusting, swelling, or increasing pain
• If psoriasis is accompanied by fever, chills, or feeling generally unwell

Book a routine appointment if:

• Any time you notice new, persistent, scaly patches that do not improve with moisturising
• If psoriasis is affecting your sleep, work, mood, or social life
• Before trying a new diet, supplement, or complementary treatment, to make sure it is safe for you
• If scalp psoriasis becomes thick, painful, or seems to be causing hair loss

Diagnosis

A doctor usually diagnoses psoriasis by looking at the skin, scalp and nails. They will ask about your health history, family history, and what makes symptoms better or worse.

Tests that may be done

• Physical examination of your skin, nails and scalp
• A discussion of your medical and family history
• Sometimes a small skin biopsy – a tiny sample of skin is taken and examined under a microscope to rule out other conditions
• Blood tests are not routine, but may be used if psoriatic arthritis or other health conditions are suspected

What to expect at your appointment

Diagnosis is usually quick and painless. The doctor may use a magnifying device called a dermatoscope to get a closer look. If a biopsy is needed, it is done with local anaesthetic and takes only a few minutes. You should receive a clear explanation of the type of psoriasis you have and your treatment options.

Treatment

Treatment depends on how much skin is affected, how severe the symptoms are, and where patches appear. Options include creams applied to the skin, light therapy, oral tablets, and injectable medicines that act on the immune system. Diet is not a primary treatment, but eating well, reaching a healthy weight, and reducing alcohol can improve the response to treatment and lower the risk of conditions linked to psoriasis.

Self-care at home

• Moisturise your skin daily with a thick, fragrance-free cream or ointment to reduce dryness and itching.
• Take short, warm (not hot) baths or showers, then gently pat the skin dry.
• Avoid picking or scratching plaques – this can make them worse.
• Use a gentle, non-bio laundry detergent and wear soft cotton or silk clothing.
• Manage stress with relaxation, gentle exercise, talking therapies, or mindfulness.
• Limit alcohol and stop smoking – both can trigger flares.
• Protect skin from injury and sunburn, and ask your healthcare team about safe sunlight exposure.

Medical treatments

Medical treatment is individualised. It may include prescription creams applied to the skin, ultraviolet (light) therapy, oral medicines, and injectable biologic medicines that target specific immune pathways. A specialist will explain the options, possible benefits, and side effects so that you can decide together.

When is surgery considered?

Surgery is not a standard treatment for psoriasis. Very rarely, if psoriatic arthritis has severely damaged a joint, joint replacement surgery might be considered by an orthopaedic team – but that is not a skin surgery.

Living with this condition

Psoriasis is a lifelong condition that usually comes and goes over time. With the right care, most people manage it successfully. Learning your personal triggers – such as stress, alcohol, skin injury, or certain foods – can help you reduce flares. Building a good relationship with your doctor, dermatologist, and, if needed, a dietitian can make day-to-day life easier.

Lifestyle tips

• Aim for a Mediterranean-style diet rich in vegetables, fruits, whole grains, beans, nuts, fish, and a little extra-virgin olive oil.
• Keep a food diary to see whether certain foods – such as alcohol, fried foods, sugary snacks, or processed foods – seem to trigger flare-ups.
• If you suspect gluten is a problem, ask a doctor about being tested for gluten sensitivity. Do not cut out food groups unnecessarily without professional advice.
• Reach and maintain a healthy weight. Losing even 5–10% of body weight, if you are overweight, can noticeably improve psoriasis.
• Include physical activity you enjoy – walking, swimming, cycling – because it reduces stress and helps lower inflammation.
• Drink mostly water and keep alcohol to a minimum; alcohol can interfere with treatment and trigger flares.

Diet and exercise

No single food cures psoriasis, but overall eating patterns matter. A Mediterranean-style diet, with limited alcohol and ultra-processed foods, helps reduce body-wide inflammation and is good for heart health, joints, and skin. Omega-3 fats from fish (salmon, mackerel, sardines) and plant sources (walnuts, chia seeds) may help, though the evidence is not strong. Avoid very-low-calorie or 'detox' diets unless prescribed and supervised by a health professional. Regular exercise – even 20–30 minutes a day – helps with weight control, sleep, stress, and overall well-being.

Mental health and emotional wellbeing

Living with visible skin changes can be emotionally hard. Psoriasis is linked to higher rates of anxiety, depression, and low self-esteem, and stress itself can make psoriasis worse. It is normal to feel frustrated, embarrassed, or sad at times. Please tell a doctor or nurse if these feelings are affecting your daily life. Talking therapies, support groups, and sometimes medical help can make a big difference. If you ever feel that life is not worth living, contact your local emergency number or crisis support line without delay.

Prevention

There is no proven way to prevent psoriasis in someone who is genetically prone, but you can reduce the number and severity of flare-ups. Maintain a healthy weight, avoid smoking and heavy alcohol intake, manage stress, protect your skin from cuts and sunburn, and treat infections such as strep throat promptly.

Vaccines

While no vaccine prevents psoriasis itself, keeping up to date with routine immunisations helps prevent infections that can trigger flares. If you are taking medicines that affect the immune system, ask your healthcare provider about which vaccines are safe for you – some live vaccines may not be recommended.

Screening programmes

There is no routine screening programme for psoriasis. However, if you have psoriasis, your doctor may check your blood pressure, blood sugar and cholesterol from time to time, and ask about joint symptoms, because psoriasis is linked to psoriatic arthritis, heart disease and type 2 diabetes.

Complications

If left untreated

• Persistent painful, cracked or inflamed skin that becomes infected – for example, cellulitis
• Development of psoriatic arthritis – stiff, painful, swollen joints that can become damaged over time
• Higher risk of high blood pressure, type 2 diabetes, high cholesterol and obesity
• Significant emotional distress – anxiety, depression and reduced quality of life
• Rarely, unstable forms of psoriasis (pustular or erythrodermic psoriasis) which are medical emergencies

Long-term outlook

Psoriasis is a chronic condition, but it is very manageable. With the right medical treatment and a self-care routine that includes a healthy diet, regular exercise, and stress management, most people live full, active lives. Many people have long periods where their skin is completely clear, and treatments keep improving. There is every reason to be hopeful.

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