Why is nutrition such an underdeveloped field...

and that meal should consist of non overprocessed food including fish, meat, dairy, whole grains, vegetables, fruits and healthy oils/fats. remember variety is great !

IF with real food is the key to good diet

These people care more about money than their health

Too many variables. It is that simple.

What about Public Health?

youtube.com/watch?v=qEuIlQONcHw&t=9s

That is pseudoscientifc bullshit.