Kate Dunbar has a remarkable success story of relief from psoriasis through adoption of Whole Food Plant-Based guidelines. She's actually a co-author of her own case report published in Am J of Lifestyle Medicine:

Research paper (case report): Managing Psoriatic Arthritis With a Whole Food Plant-Based Diet: A Case Study by Marta Lewandowska, Kate Dunbar and Shireen Kassam, Am J of Lifestyle Medicine, Feb 2021.

Kate Dunbar shares her personal story in a blog entry too: Reversal of psoriatic arthritis with a whole food plant-based diet (2019), hosted by Plant Based Health Professionals UK.

Kate turned vegan about 13 years ago — it helped her psoriasis but not entirely. In 2018, she turned Whole Food Plant-Based, SOS-Free (ForksOverKnives diet + no-salt) to say goodbye to psoriatic arthritis! What was the difference betweeen her Vegan [Before] diet and her WFPB-SOS [After] diet?

Kate Dunbar's personal story is a rare case report published in medical literature in which the shift in meals was from a Vegan to WFPB SOS-Free diet.

• Kate's Vegan [Before] diet had lots of processed foods (with "oil, textured vegetable protein, vegan cheese, vegan sausages, soy cream, vegan mayonnaise, soy margarine, pastries, cakes, biscuits, ice cream, hummus, sugar"), refined grains (white flour, white rice), very few beans, veggies and fruits, no nuts and seeds.
• Kate's WFPB SOS-Free [After] diet reduced processed foods to only soy milk, sauerkraut and occasional use of soy sauce and miso. Nuts and seeds were introduced (1+ servings). Serving sizes of veggies, fruits and beans (pulses) were boosted. Grains were exclusively whole grains (no refined grains). An SOS-Free diet has no Salt, Oil or Sugar.