I have not done a 5 day fast. I am still relatively new to fasting. I tried to do a 72 hour fast last month, but broke at 50 hours as I felt like crap and got to the point where all i could think about was the fast and it was disrupting my day to day. i wasn’t even hungry, but I just didn’t like how I felt.
I hope to get that 72 hour fast at the end of this month.
I did notice on the second day of that smaller fast I got somewhat Hangry, without the hunger, just like you said.
But my mood was just off, every little thing seemed to rub me the wrong way and my fuse was as short as when I was on carbs and hadn’t eaten in 6 hours.
I don’t know any definitive science behind it, but I think it is pretty much the same response as when we got hangry with carbs. When we reach near our max fast our body feels like it is out of fuel and reacts sort of like it is being threatened, which is why you become hostile. When we were on carbs that was just a matter of hours, but with fat, and our fasting experience, it goes into the days. Just my thought