Why are my non-keto friends convinced they know more about this diet than I am?

My friends seem to be under the impression that I have not researched the science behind ketosis and ketogenic dieting. It's as if I haven't read books upon books, listened to podcasts, read websites and medical journals, etc., and had this diet recommended to me by both my physician AND psychiatrist!

I try to break down in simple terms how and why the diet works, I assure them that my blood screens are good and my blood pressure has gone down, and my weight is dropping. Some of them have been less vocal about their disapproval as drop pounds but I guess I'll just have to keep losing weight until they shut up entirely.