Okay, I see where you are coming from. However I can't say that I would agree that "more hours on the subject" is related to a "fixed idea in medicine." Particularly the presence or absence of a course means little.
Absolutely. What af_newbie has pointed out is an apparent failing of US medical schools. It says nothing about nutrition being a "fixed idea". Now, I didn't train and don't work in the US, but where I trained we had a specific nutrition module, covering everything from the basics of carbs/fats/protein, right through to the hormones involved in hunger and the molecular generation of energy, as well as touching on nutrition when relevant to something else we were learning.
Certainly in Intensive Care, nutrition is hugely important to what we do. We have a range of different liquid feeds available, all with their own pros and cons. We have a specialist ICU dietician attend the unit every day to assess patients' nutritional needs and set up a personalized nutritional plan for each patient. There are many studies, with new ones coming out all the time regarding type of nutrition (gastric feed versus intravenous nutrition), type of feed used, timing of feed, rate of delivery, electrolyte/mineral/vitamin supplementation, etc, etc. There is certainly no "fixed idea" that nutrition isn't important, and similarly there is no "fixed idea" that one type of regime of nutrition is the best.
Now, if US med schools aren't teaching nutrition, and US doctors don't feel confident in talking to patients about what constitutes a healthy diet, then it might help to explain why the US has one of highest incidences of obesity in the world.
Maybe the "fixed idea" was the wrong word. I agree. I should have said the "prevalent opinion in the medical profession". Most doctors dismiss nutrition as completely irrelevant. They know drugs work and work fast without changing the patient's lifestyle.
As for the nutrition itself, well, everybody is different (metabolism, activity level) but most people benefit from "mostly plant-based" diets.
https://www.youtube.com/watch?v=FX58PyQwrcII tried the mostly plant-based diet (plus eggs and fish) and I drank only water for 6 months, my HDL is 40, LDL is 82 (still high), total cholesterol is 140 (went down from 270), my BMI went from 24 to 20. When my doctor saw my blood test results, she ordered a second test to validate the results. Now we exchange tips on the best sources of macros and micros. She never saw such a big improvement in her 40 years of being a family doctor. Oh, and the side effect was that my testosterone went to 798, and I am in my early 50s.
I want to get it to 117 total cholesterol like that old guy in the video.
Now, I firmly believe that we are what we eat.