I go very quiet, pale, grey, shaky and have panic attacks when I get hungry and if anyone tries to calm me down, then I can get angry because I just know that I need food and that takes precedence.
I thought that was quite normal until recently as it's been happening since I was a child. I've always marvelled at people who could 'wait until dinnertime' before eating even if they were very hungry, or who could travel without carrying something to eat with them, because I've never been able to eat by the clock - I've always had to eat by my own body clock and I've always had to make sure I have access to food wherever I am.