I was married to a doctor, helped them study for board exams, etc and was surrounded by other doctors within our social circle. What most people don’t realize, and most doctors themselves refuse to acknowledge, is how limited by specialization their knowledge can be and how the education of most doctors stops after med school and residency. Nutrition, for example, is barely covered at all.
Yes, there are continuing education requirements and countless journals but most doctors do the bare minimum and don’t keep up. I’d even argue that most physician knowledge tends to be updated more often through drug and instrumentation reps promoting their products by taking them out to dinner and entering them into referral programs, etc.