I just thought I'd add to the discussions with my experiences if it helps others.
I've suffered from Psoriasis for the last 15 years which came on following a serious fall from a ladder when aged 55. The weals covered by thighs, lower legs, back of forearms. Itching and bleeding. All over my back spreading to my chest. Constant itching and unable to swim or use the gym with confidence. My scalp psoriasis beginning to spread to the temple areas.
I've tried everything under hospital dermatology dept. guidance from initial coal tar treatment, steroids, Dithrocream, Soratinex, all sorts of topicals and strong light treatment all with short term improvement but no long term affect.
Finally in 2018 I was told that Methotrexate was the only solution left and assured this treatment would work for me with few side effects. After researching I wasn't prepared to take the chance..... rather to go down the dietary route after having researched books by Adam Enaz, Dr John Pagano and Hanna Sillitoe ('Radiant') all concentrating on curing "leaky gut". I thought why put topical stuff on the skin if the problem is due to a deep rooted cause coming up to the surface of the skin.
Following Hanna Sillitoe's book to the letter I started an initial diet in October 2019 concentrating on lots of dark green leaf vegetables; celery, cucumber, spinach, avocado and apple home-made juice every day. I cut out all dairy products, gluten, the nightshades family (potato, peppers, tomato), processed foods, sugar, pastry, alcohol, red meat, caffeine, spices. oranges and certain acidic nuts such as walnuts.
Substitutes include goat's butter, goat's cheese, almond or coconut milk, sweet potato and plenty of almonds. Plenty of fish and vegetarian dishes and gluten free bread, together with lots of exercise.
I had to concentrate on alkali foods and cut acidic foods.
Supplements including daily slippery elm bark powder, selenium, zinc, vitamin d3 and milk thistle tablets.
This was my last move.... it had to work. My wife and I were both committed and all credit to her for very creative shopping and cooking.
Lo and behold after an initial increase in irritation after approx 6 weeks the sore, itching flaky weals started to clear up.
After 12 months of strict diet I started gluten with no bad effects and after 15 months tomato. So far so good!
Now nearly 18months later all the itching has gone, the red weals have vanished and clear skin in their place. There is the odd flake which is quickly controlled with Enstilar foam. I look forward to restarting further foods after 18months.
Unfortunately this diet doesn't seem to have had any effect on the scalp but Diprosalic scalp lotion keeps it in check.
It's been a long haul but certainly worth it as every month along the way I've seen an improvement albeit with the odd setback!
I hope my experience may help others.