I have been autistic and dyslexia my whole life, but I was not diagnosed as being autistic until I was an adult. By the time I was about 44-45 I had arthritis in my neck, hands, lower back, and feet. I also had psoriasis which rapidly worsened when I started taking NSAIDs to manage the arthritic pain. Prior to this I worked out in the gym 5 days a week and yet I continued to gain body fat.
In early 2017 I went on a Ketogenic diet and my arthritis seemed to be gone in about 3 weeks or so and psoriasis that often bled through my clothes seemed to be greatly improved. I also noticed a vast improvement in cognitive function and a more stable mood.
By late 2017 I had moved to carnivore or a zero carb diet. The Psoriasis is not quite gone, but I think I will eventually figure out what the final trigger is and resolve this.
As for my autistic type symptoms, I seem to be far less likely to perseverate for long periods of time, my anxiety is a lot better, especially after I had been on carnivore for about 6 months or so I noticed that anxiety was much harder to trigger and it has less intensity to it. I have also noticed that the symptoms of dyslexia have improved, I am not able to often retain things like phone numbers in order with little or no effort. I can also tolerate sunlight much better. I also seem to have an easier time filtering out a noise and other distractions including tactile ones that constantly competed for my attention in the past.
I made a short video about it.