Pretty much all of everything most people know about food is wrong.
Just look at all of the folk waddling along as well as those who are in shape are in a total mess inside when it comes to their hormone levels, endocrine function and various other biomarkers that no one pays attention to and even if they do test won't show the true pic as the levels are so skewed unless you know what you're interpreting.
Forget eating, 90% of people aren't even breathing correctly and thats even more fundamental. Says everything really.