Okay..I know I am a single bachelor living the life:) but having been an observer of life most of my life:)...2 things come to mind is society peer pressure being that we as a society must look physically fit and be a supermodel esp with the latest fads to become a vegitarian and eat no meat so I can look like a supermodel along with the many other peer pressures out there, or 2, she's developed a case of obessive compulsion disorder..just small observance based on her habits there..
I have a 20 year old daughter who has NEVER had a sip of alcohol, NEVER smoked a cigarette or a joint, never took a drug of any kind, and won't drink anything with caffeine. She'll eat no fat; the only meat she eats is boiled chicken breast without the skin. She'll eat no salt, and no packaged food, just fresh fruits and vegetables (boiled sometimes). She works out everyday at the gym and does pilates everyday at home. She has a job, and is getting A's and B's in college. She's considered to be VERY good looking by all the boys. She's never been in trouble of any kind, never had a traffic ticket, never needed any sort of discipline ever. When she leaves the house she says "'Bye mom, 'bye dad, love you."
And yet I'm STILL stressed about her. She's too perfect. She'a a rigid perfectionist who drives herself too hard to be "the best". As a result, she's often stressed out about some imagined catastrophic failure that she'll never recover from. She can be very moody and snarly. She's on anxiety medication and anti-depressants. She's prone to getting hysterical. I wish she'd just relax a bit and learn to enjoy the simple things.
I don't know where she gets it from, neither me or her mother are that way. It's very ironic that too much of a good thing can actually be a bad thing.