Starvation apparently also causes depression (Minnesota Starvation Experiment - Wikipedia, the free encyclopedia) and aggression towards oneself (note that one of the experimental subjects amputated three of his fingers with an axe).
Unfortunately, I got to see a starvation response in person when my mother went on an extremely restrictive vegan diet that almost landed her in the hospital. She didn't get aggressive, but she really obsessed about food - is this healthy, is this okay to eat, does this have too much fat/carb/sugar in it - all at a time when she was 30 lbs. underweight and almost at the hospitalization stage. I spent a few months forcing her to eat and she gained back the weight she needed - and as she got back to normal, the obsessions went away.
This, btw, is why I am extremely vigilant about the 80/20 aspect of the Primal Blueprint, and about never starving myself. I think a lot of Americans have a low-grade starvation response going on - hence their obsessiveness over calorie-counting and "good" and "bad" foods. I don't want to have that happen to me.