these are extremely outdated recommendations that make no sense. most of the basis for those are studies that took direct correlation as causality. the problem is a crappy lifestyle which incidentally typically includes processed and red meats in large quantities in the western world. saturated fats are hardly a good indicator of anything when you disassociate them from the lifestyle and foods they come with for most people. blue zones are now finally coming out as simply just the places where records sucked. there are plenty of populations with centenarians that had meat rich diets.

yes obesity is bad, as the source enemy of most diseases that kill and are not cancer is inflammation. find a diet that makes you not obese and have low inflammation, that is vastly superior to "Mediterranean diet" or "plant diet" for everyone.