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.