Studies on human nutrition are extremely limited. If you'd like to see a case reports about keto eating putting Diabetes Type 2 in remission see below:

https://www.frontiersin.org/articles/10.3389/fendo.2019.0034...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1325029/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7342268/