Actually, China is finally getting a handle on their number of abandonned kids. The one family/one child rule doesn't apply to adoptions and as Chinese citizens become more wealthy they've turned to adoption get more children. Because of the huge increase in demand, China has made the rules for adopting very strict, both inside China and by foreigners. China has reached the point where they can be very picky as to who gets to adopt a child. The demand by foreigners has outstripped supply (God, I hate describing it like that) and so the Chinese government will only release children to people they consider "the best of the best"

It's not that they consider someone with a high BMI to be an unfit parent, it's just that there are some many people applying that they can be very picky. The Chinese government had to thin the ranks some and so they decided that all adoptive parents must meet certian levels of health and fitness (among other requirements).
Obviously, Chinese adoption is a subject near and dear to my heart and I can lecture on it for hours.
-Blast