@Flub From what I’ve read, our bodies need either glucose or fat to run on so for those of us doing some form of keto we need fat for fuel. Your doc friend is fueling from carbs but we aren’t. There is an organization called, The Charlie Foundation, that uses a very high fat diet (very similar to the PM one) for folks with seizures or other brain issues. The story of how that org came about is worth reading. Charlie had seizures and nothing helped until his parents put the boy on the Ketogenic diet. I can’t remember if they worked with a major hospital at the beginning of the diet or not? https://charliefoundation.org/about-us/
Flub, have you read, “The Fat of the Land” yet? It tells the wonderful story of Mr. Vilhjalmur Stefansson and his “all meat” dieting days. Doctors had him and another friend of his eat nothing but meat for a YEAR while they tested and recorded their results. When Stefansson didn’t get enough fat he had diarrhea and felt ill but with enough fat both men did great.
Dr. Shawn Baker, MD, had some great info at MeatRX: https://meatrx.com/
Dr. Paul Saladino, MD, is awesome too: https://carnivoremd.com/
IF I had a doc friend I was trying to convince, then I’d show him other docs who are joining the carnivore lifestyle. There are other docs out there as well.
Flub, I was 3 years keto and am almost 4 months carnivore. I’ve had a membership to “Diet Doctor” (another great website with various docs on board with keto diets) and read of M A N Y folks whose glucose rises with their protein intake. I’m not diabetic, yet even mine rises as the day’s meals happen. I don’t think the “experts” fully understand all of the ins and outs of this yet, but the ketogenic diet (high fat) has been around for decades.
Has your doc friend ever been around a patient with crohns? I have. Hanging around an IBD forum has got to be one of the most depressing things out there but PM is healing folks with IBD issues and other auto-immune diseases. Heck, there are folks being healed of IBD just by going plain ol’ carnivore. 
I read the blog of one guy who totally got rid of his crohns by going carnivore for a year. He was inspired to do so by Mr. Stefansson.
I don’t blame your doc friend for being skeptical. When I was first going keto someone was doing an all meat May at My Fitness Pal and I thought they were nuts, LOL. All I know is that even 3 lovely years of regular keto did NOT get rid of my bowel issues. After only 3 months (and PM says it usually takes at least 6 months) my bowels are doing great.
I will say this…I’m 63 and like to exercise. If I exercise the way I did on keto my glucose goes up past the PM range, sigh, so they are right about exercise. From what I read, they began with a regular Paleo type of diet but they weren’t getting the results they wanted. The PKD has given them the results that they desired. Hang in there my friend. Give your doc friend food from other docs and hopefully he’ll see the light. 
. My housemate is a doctor and he does not understand the diet, He does not see why keeping blood sugar so low would be beneficial. Does anyone know why it encourages healing? He has also expressed that he thinks Paleomedicina are a bunch of quacks. I find this offensive but can not offer up acceptable evidence of the diet’s efficacy, since all the “evidence” is self published case studies. How do you guys explain/justify why you’re doing this to other people? Not that justification is required of course.
