An interesting study here - actually done in MS patients - that supports thinking keto diet may be useful in PMR/GCA where a large proportion of the inflammation is cause by the cytokine IL-6
"Notably, pathway alterations included a reduction in the proinflammatory cytokine interleukin (IL)-6, accompanied by an increase in IL-10."
The study is small and has many limitations but is still of interest for us I think.