The concept that insulin is a fat storing enzyme used to ready people for times of hardship by storing fat during times of plenty is really key to a lot of this...
Agreed. I've been following this thread with interest for quite a while, though not following a keto diet myself. Since being made redundant (effectively retired) over two years ago I have gone from 83-84 kg to 74-75 kg, part of which is due to being able to manage eating better (and not around commuting and work timing), and part is dietary change and more time for exercise / training.
I have always been slightly overweight, which I think is partly due to a degree of insulin resistance. My main focus is now time-restricted eating in an 8 hour window (I hesitate to call getting slightly hungry late morning as a fast) and eating with insulin levels in mind, which really means
lower carbs (but not really low carb as I still eat a little bread, pasta, sweet potato, fruits etc.) and higher fat and protein. More low HR exercise following Covid in Jan (walking, then cycling, sculling & gym) has rebuilt my aerobic base somewhat, and 'fasted' morning sessions (garage gym / 1 - 1.5 hours sculling / 20 -30 mile bike bimble) seem absolutely fine.
So, lower carbs / higher fat seems to be working for me slowly in weight loss terms (and I have higher muscle mass than a few months ago, so fat loss) and in allowing the training that I wish to do. We'll see how it goes as more high intensity work comes in.