Being in your head is not simple, you know.  Pretty simplistic jerk assumption. Many disorders are genetic, many are actual conditions, and yes many are mental.  Many mental issues stem from imbalances, abuse, or addictive compulsions.  Overcoming them is possible, but it takes willpower and often professional help.  It doesn't make them any easier than injuries or physical conditions.  Take addiction. You can beat it, but you'll never rid your brain of it.    We're supposed to be better than the fats, not less informed.