Should weight be an issue in adoption?

Someone on another board posted this article. Should weight come into play when deciding if someone can be a proper caregiver to a child? In my opinion, it can go either way. If someone who is morbidly obese and unable to care for themselves, then I would say they shouldn't be able to adopt a child...if they can't care for themselves how can they care for a baby? But a person who is still active and generally healthy...in this man's case...then I don't think weight should play into it. It's a fine line...China has restrictions on weight to adopt internationally...no one is in uproars over that. Is it discrimination when a judge in our country rules that weight is an issue but not when China does? Would love to hear other's ideas...