My take:
Eat only food that does not need a nutrition label to identify what it is, was or might have been !
Home cooking only - save the money and time wasted on franchise junk food. 
No sugary starchy white anything, ever.
Fruits and veggies - a medium rare lean steak .... over a charcoal barbeque  .-))
Ignore all the diet fads !
I achieved a healthy ripe old age without any Nanny State originated nutrition advice ....