I don't know. I read and really enjoyed this book, and even follow a mild version of intermittent fasting for a while. (only ate 12pm-8pm for a while). Then a

I don't know. I read and really enjoyed this book, and even follow a mild version of intermittent fasting for a while. (only ate 12pm-8pm for a while). Then a few months ago I started following some fitness YouTuber's advice, which mostly boils down to "count calories and consume less calories than your body uses". I started a basic course of counting calories and eating at a deficit, and dropped ~7kg in a few months (and hopefully am still going). It wasn't even that hard - mostly counting everything and cutting out some of the stuff that is really high in calories. I still ate fairly well, e.g. I'd eat my favorite hamburger - just would skip the fries to be under the calorie count. Of course I've only done this for a few months and it's hard to say if my body will eventually force me to expend less energy. I take comfort in the fact that a lot of bodybuilders go to extreme lengths to drop down in body fat, so they've done anecdotal research on this area a lot. And most of them are not following intermittent fasting, or keto, or anything like that - they're just reducing calorie intake when needed, and going up and down in weight fairly consistently.