I don’t have PA or RA but I have had pretty intense joint pain from complications from multiple Lyme infections and I can say fasting has changed my life. You are conflating daily hunger triggering pain vs a systemic, long term change. There is a ton of evidence that exists and continues to be added to that the longer you put you body into autophogy the better results there are for things like inflammatory and immune diseases. Also the more your body produces glucagon vs insulin over the long term has been a significant factor in my reducing inflammation in my body. I have like 90% less joint pain now than I did 2 years ago. Again not a direct correlation but if you want the lived experience of someone who has done it long term and isn’t just baiting some hype article online then here it is. I’ve also had long conversations with my doctor about fasting and the biological mechanisms it triggers to reduce inflammation system wide and how he has seen significant results across the swath of patients that he’s recommended it to to help with certain conditions. I went in for blood work to make sure fasting wasn’t causing any problems and had a pleasant surprise that my doctor supported it, he never brought it up unprompted.