Quite shocking, really:
I’ve often wondered if one of the reasons longer term fasting works is due to burning fat and removing some of the PUFAs from our fat cells? I also wonder if something similar is occurring in high P:E diets (higher protein, lower fat), though protein always throws a wrench into the works (higher protein is associated with higher energy output).
I also wonder if this could be one reason why some lose weight quickly on keto and some take a while? Maybe there’s less PUFAs in those who lose weight quickly?