Auf dem ersten Bild hat aber jemand vergessen ne Diät zu machen, oder?
Two fundamental errors:
1) Assuming that what works for you will work for everyone else.
2) Assuming that what works on average will work for every individual.
"Bros" often commit the first error, and tend to react poorly when they're called on it by sciency folks.
Sciency folks (people who apply research uncritically, at least) often commit the second error, and tend to react just as poorly as the "bros" when called out on it.
Be vigilant about avoiding both issues.