I know there are people who feel obesity is a dangerous lifestyle and wouldn't want to see overweight parents passing on these bad habits to young kids. And the problems overwieght kids face - teasing, low self-esteem and discrimination. But would obese adults be denied an adoption because of it... Doubtful.
The bottom line is what is best for those kids. When there aren't enough "mom and dad" adopting, how can a loving home by 2 moms or 2 dads not be a good enough. And why do some people feel so inclined to act they have a right to judge others?