Most doctors (in the US anyway) don't cover things until there is a problem. For example, someone can eat a diet that will lead to heart disease. But, doctors won't tell them to make changes until problems are already showing up.

This has to do with the way billing works for healthcare in the US. It's billed as sick care.

And, most doctors have almost no training on things like nutrition. So the impact of that isn't something they can help with.

If I were to suggest self study I would look at a couple things:

1. The Blue Zones. These are areas that researchers have identified where people live longer and thrive for longer. Something like 10x the number of people live past 100. Much lower rates of disease. Looking at how they live. There's a good book on it at https://www.amazon.com/Blue-Zones-Second-Lessons-Longest/dp/....

2. A good book by a dietitian. I like "The Proof Is In The Plants". Despite the author being vegan and the book talking about plants, the book covers meat and dairy along with amounts that are healthy. All of the recommendations include explainations of how this is known. https://www.amazon.com/Proof-Plants-science-plant-based-plan...

Whenever you read a paper creating a new term (like "Blue Zones") -- you can guarantee that the author also has a book out with the same name.

And so... https://www.amazon.com/dp/1426209487

They usually also have a company with the same name that sells speaking engagements or consulting... https://www.bluezones.com/

And of course, you need a modestly astroturfed Wikipedia article... https://en.wikipedia.org/wiki/Blue_zone

And don't forget a TED Talk! https://www.ted.com/talks/dan_buettner_how_to_live_to_be_100