My wife says that I get moody. My observation is that when I’m in the fed state, I let lots of stuff go and when I’m fasted, I’m calling things out because I have more energy and less brain fog. Fasting does make me less tolerant, eating makes me more tolerant (and lazy)
You are (probably) having ghrelin spikes, which then fade. Ghrelin controls the feeling of hunger, and is released by the stomach based on historical eating patterns. It’s amazing how much how we feel can be instigated by one hormone. See the chart linked
https://blog.thefastingmethod.com/fasting-ghrelin-fasting-29/