Anecdotally, anger and hate were keys in my diet-soda & coffee based IF diet that helped me lose about 20lb (165->145).

More seriously, my irritability and lightheadedness got alot better after about a week, and it was worth just embracing it until then.

I lol'd, but I did notice (with some dismay, I should probably add) that I really get shit done when I get angry about it.