However, parsing signal from noise does seem a very difficult proposition.
(But then, this also means that knowing it for sure would be useless.)
Everyone knows it, I don't need to list it: eating clean, getting good sleep, plenty of exercise, etc.
And furthermore, though our healthcare system seems only configured to deal with things once they become emergencies, metabolic disorder takes your whole life to take root. The time to start making positive changes is now.