When I was 20 I was diagnosed with a pre-cancerous condition in my uterus caused by being obese (endometrial hyperplasia with atypia), it was extremely depressing - required two surgeries and a life long hormone therapy to ward off a hysterectomy until I'm done having children - but I'm currently anovulatory and cannot have children. My gyn and GP believe that losing weight should help but it'll always be a struggle. I'm now on a drug called Megace which is a cancer drug - and also an appetite stimulant, and definitely hasn't helped me in the last two years. I've lost and gained 60 lbs in the last year and a half alone (which I tell myself - it's better than gaining an ADDITIONAL 60 lbs)
It was hard because I knew about all the other risks of being obese (heart disease, diabetes, etc) but I NEVER knew that I could have these kind of reproductive issues, and so young at that.
My support system is not great. I'm in a taxing clinical internship and my husband eats like a 13 year old and has no interest in changing his ways - he works a physically taxing job overnight so he feels justified to eat whatever he wants and feels he gets all the exercise he needs from work. And granted he's not even overweight, it's still difficult. He just wants to order pizza and play video games. He would like kids, but has always made it known he'd be fine if we didn't.