That's adrenal stress, it's a phase usually you should adapt your body to it gradually, for more details check the following:
Discussion
I think it's best to just avoid it.
Evolution designed us to dislike starvation for a reason. Listen to the hundreds of millions of wisdom encoded in your genes and avoid fasting when possible.
This makes no sense at all. Plentiful resources have existed for first world cultures for less than 100 years. This is a literal blink in evolutionary chronology.
Still missing the point
Evolved preferences are a clue to what parts of our reality are good for us and what parts are not
Just because our ancestors starved (reality), it does not mean that starving is good us.
You can tell the difference because we evolved to prefer not starving.
Starving is probably the wrong description, it invokes images of keto acidosis, a pre-death condition that is exceedingly damaging to the body. Scarcity provokes the desire to be well fed, and my argument is that modern beings don’t manage plentiful resources in a healthy way. This is much like the child raised in financial poverty never being able to accumulate enough wealth to mitigate the mindset of poverty.
Well, yeah that's a good point. Maybe as a way to prevent over eating, fasting may have a place
I'd still recommend to eat whenever you want and try to workout the emotional (or other) reasons for over eating some other way than fasting
These conversations between people are the source of goodness. Thank you for the dialogue. I recommend you try a short fast and see how you feel. I’m genuinely interested in the outcome. I don’t know for sure you know? ❤️