Didn't that Japanese captured, famous PILOT( can't think of his name ) because he was an indentured cook for the Japanese while in the Prison Camp, Eat all the fat in the fat trap to survive ?? Died from atherosclerosis at a young age ? Too much fat is like too much alcohol
I don't think so and even if it were remotely true, wouldn't worry me at all. Keto isn't just about eating a lot of fats. It's about eating a lot of the good fats and avoiding the sugary carbs. Many people on a standard American diet will eat more bad fats in a day than I or most people doing keto will in months cause we purposely steer clear of them. High carbs, also very much part of the standard American diet, will cause more damage to ya. Also a bad idea to combine high carbs with fat. This is, no doubt, a main cause for the high percentage of fat asses in the US. Go to your fast food restaurants where they cook their cheap carby food in their cheap oils and the fat asses continue to eat it up. There's a lot more highly processed cheap oil rather than good oils in our food supply so you have to know which ones to avoid. Actually would be easier just to know which ones are good and need not be avoided.
If you stick to the good fats, the fat that naturally comes from meat and the fat from the better oils like olive oil, real butter, avocado, coconut and the like, ya can't go wrong. Fats don't even have a bad name any more, not as they did during the great fat scare propaganda in the 70's. You'll even see nutritionists advocate for more intake of good fats now. Turns out the worst fat by far is that which is man made, trans fats. Nature didn't make the fatties fat and sickly. Man made all the highly processed food that made the fatties fat and sickly.