I have a co-worker friend who has recently begun raving about the Keto Diet, which places a major emphasis on saturated fats. Some of his explanation did make sense. I've also noted for a long time that the healthiest cultures with the longest lifespans tend to use fish and rice as the staples of their diet. The longest lived person officially recorded attributed her longevity to olive oil, which she rubbed on her skin daily and put on all her food. She also ate about a pound of chocolate a week. There was an accomplished body builder on another forum I frequented a couple years ago who recommended a super health diet of boiled chicken breasts and steamed vegetables. Around that same time, the world's oldest person was here in Indiana, and her diet for most of her life consisted mainly of starchy foods.
My impression is that the body has a bunch of various needs, and there are many ways to provide those needs. Different methods will work best for different people. Perhaps the most important thing is to have some consistency. Your body is a bunch of processes that like to settle into routines, and will learn to adapt and make the best use of whatever you're feeding into it if there is some regularity.
Beyond that, the whole dietary health issue is such a cluster fuck of conflicting information that I've kind of given up on it. I only try not to eat too much of stuff I know is unhealthy.
Also, that potential law in St Petersburg sounds incredibly dystopian. I wish I could watch the video right now.