On the other hand, we're only talking about now lean and healthful 70 and 80 year olds curing their diabetes, arthritis and other chronic ailments by consuming 250 grams of fat from animal sources per day, which is like five times higher than "recommended" in total fat, ten times higher in saturated fat.
Here's what I know: the more animal fat I eat, to the exclusion of carbs and the reduction of protein to moderate levels, the better I feel. I can easily stay up into the the wee hours without being tired, but I can also go to bed without being tired at 9 pm, go right to sleep, and sleep soundly for ten hours. I haven't slept for ten hours since I was a teenager. And when I rise, a noticeable leanness and firmness all over, as though the very last bits of generalized inflammation have been drained out of me overnight. When I'm not sleeping, it's high and steady energy continuously. No more afternoon malaise. It's a wonderful feeling.
Of course, high-fat diets will give you the benefits of energy and weight loss, but they are just not good for you.
Go figure. You're seeing this sort of thing more and more. The evidence of success in reaching some goal or point can no longer be dismissed or ignored. But we "just know" that fat is bad.