Caffeine, sleep type, height, baldness, diet response
5 questions
It is very much a pattern, not a coincidence. PCOS is one of the more clearly familial hormonal conditions in women, and the research is consistent: having a mother or sister with PCOS meaningfully raises your own risk. Your gynaecologist is right to ask.
She is, in part, genuinely built differently, and I want to say that clearly first because the 'she must be secretly starving herself' assumption causes a lot of unnecessary self-doubt.
Neither of you is broken. You are both completely normal, and you are quietly demonstrating one of the most charming little quirks in human genetics, because there are actually two separate things going on here, and most people only know about one of them.
Mostly your DNA, with stress playing a smaller and slower role than the internet wants you to believe.
No, that is a half-truth. A major hair-loss variant does sit on the X chromosome that men inherit from their mothers, but more than 200 markers from both sides of the family contribute.