>>11853898this is the fundamental truth.
the other stuff is cultural or social.
american/vegan/keto/paleo/etc...
the average human has a surplus of cheap low-quality food, with a bunch of sugar...
normal humans in that situation become sugar addicts, straining their insulin response, and their system can't handle sugar or saturated fats well...
lot of fat people, and then u turn on your 'device' or your television, and everyone has filters/camera-motion/hair&makeup/cosmetic surgeries/PEDs/money/environment/etc...
so there is market incentive to cultivate different meme diets
hit your essentials, avoid stupidity, mind your fiber, get a test done every 6m-yr... and you've got diet nailed.