Women go through more hormonal rollercoasters, including PCOS. Men don't have ovaries :P It is a theory that many of the cases where women killed someone else or went on a rampage did so because of their menstrual cycles throwing their logic out the window. Don't ever cross a woman!
Most of thyroid disorders are autoimmune (I have Hashi's) and having one makes it more likely to have another condition linked. Though, men are as likely to have thyroid disorders as well, if only a little less likely.
Then there's the thing about serotonin, a mood booster. Carbs will push a surge of serotonin, and some people can get crabby if they don't have carbs. People have to figure out what their bodies need.