I totally agree , the more I read these threads you can realize that problem.At the other end of the scale, I'm eating a relatively high protein, higher fat, low carb diet. I've lost nearly two stone in 10 weeks, my blood sugars are better than ever and it looks like I may be about to get my best Hba1c for a long time. I'll also find out about my blood lipids at that time.
What everyone needs to remember is that a GP is not an expert on diet and has a set of guidelines from their national health authority that leads them to a certain direction, backed with a set of evidence, some (often much) of which is outdated.
So while your doctor is surprised, it is unlikely that she has done the research into diet that many on the forum have in order to draw their conclusions.
I'm not saying she is wrong, but she may not have as much evidence to hand as many people think. GPs don't have in depth knowledge of everything!
On @zand 's video clip the doctors and experts advised us to discuss things etc; with our doctor/Dietitians. The first thing I thought was "we do not have doctor/Dietitians with that kind of knowledge at our clinics.