Petter Attia writes about the ketogenic diet in depth [0]. He's an MD, and references studies throughout his writing. They're not always "keto" studies per se, but they are often studies on parts of the keto process. I highly recommend his blog for in-depth keto reading.
Looks nice! I've not yet received an email, so we'll see how good they are - but I would also appreciate purchase links and difficulty ranking if they're not already included.
The way people talk about it often feels like woo. (Not looking for anecdotal "it worked for me" responses)