Why this shift in our bodies? I mean, does this prove that we aren't meant to eat carbs or does low carbing make it so we can't eat carbs if we wanted to?

I think I understand the coffee thing. Our body gladly gives up it job to do our synaps thing that caffeine takes over and after a while of no caffeine my body can stay up and alert without added caffeine and when I drank the coffee I had too much and my body didn't need the caffeine so it felt like an over dose.

Am I close?