Really interesting. Thanks for sharing.
I’m not a scientist, but his fuel-partitioning theory sounds like a plausible hypothesis. I’m so surprised at how consistently I’ve managed to lose weight on MJ. I obsessively calorie tracked at the start - both to stay in a deficit but also not to go too low when I started to feel exhausted. But as I’ve got nearer to goal I’ve been less bothered about tracking and have continued to lose 1-2lbs a week, eating more calories at a lower BMR, doing the same amount of exercise as when I first started. So my calorie deficit has shrunk, my BMR has gone down but the rate of fat loss has remained steady.
What he doesn’t mention is the muscle loss and how this is accounted for. Unless again, like a reduced appetite being a by-product rather than the cause, muscle loss is a by-product of the reduced calorie intake.