I was on a non-nutrition related forum, mentioned low carb for diabetes, and half the people were all "Of course! What is this, the Dark Ages?" And the other half were all "MY doctor/the ADA/nutritionist said healthy carbs at every meal!"

A friend's father embraced low carb and got great numbers at the doctor's office. They said, "Keep it up" and passed him to the nutritionist. Who told him he wasn't eating "enough carbs."

Fortunately, he feels so good he's not about to fall for that, but a lot of people just get confused and give up.