Good post, and something people can consider.
Caution is definitely required.

I myself am thin, and don't overeat, so I would not want to do this for extended periods of time. I eat slowly and not large meals. So I don't fast, but sometimes a meal get's skipped once in a while to possibly, maybe, lol.. create the stress-factor of evolutionary benefits that you talk about.. in a small dose... lol

Yo're not promoting any fad diet or anything, but the whole "keytones" thing is a lot over-hyped recently. I just want to say that in case someone gets hooked on the mention of keytones and goes for the fad of a keytone diet.

Take care. Peace.