I have been hearing for at least 20 years that calorie restriction increases lifespan [0]. I have not seen compelling evidence of this, but I know a lot of people believe it.
[0]: https://sitn.hms.harvard.edu/flash/2020/can-calorie-restrict...
[0]: https://sitn.hms.harvard.edu/flash/2020/can-calorie-restrict...
The point that I'd like to make is- if you think a comparison between hunter/gathers and the modern human is illustrative for a diet where our phenotype thrives best, sure, their food arrive at more irregular intervals than the modern human and they probably binged on what was in season at the time (which might give us pointers for our own diet) but I think the concept of perpetual calorie restriction as a full time human diet is infantile and quacky.