From Ben Bikman I understand that other metabolic advantages are increased mitochondrial density in brown fat, and when it’s really working, in white subcutaneous fat as well. Via uncoupling protein signals the energy can be “wasted” at the mitochondrial membrane to produce heat. Bikman believes the evidence points to signalling via ketones. My n=1 is that I had developed uncomfortable cold feet in winter with white patches on them, and didn’t tolerate cold very well. After changing my diet to produce ketones I heated up and have not had a single cold foot since and need less bed covers.
I also notice other ways that my body burns through energy. When I’m hanging out with other people in a room I notice that I am MUCH less still. It’s really striking. I’d guess this is mediated via adrenaline so that my body can waste calories and stay at the same set point year in year out.
This is the sort of stuff I find most fascinating! The body is so clever when it’s running well