I think people need to maintain a healthy weight. Our country is very weight conscious at the moment, so I think that's what's upsetting that Fat-acceptance group. I don't think accepting obesity is a good idea, but I also think people shouldn't be discriminated against for excess weight. Also, there is a difference between being overweight and obese! That group really didn't make a distinction.
I know some obese people who have had no additional health problems and I know some who had major health problems (advanced diabetes, heart failure.) It's naive to say that being obese won't cause these terrible diseases. I read the article on cnn.com and the fat awareness group really didn't think it was a problem.
As for being super-skinny, our country is too obsessed with it. Our actresses look like lollipops (stick with a head.) Often women who are a healthy weight feel bad about themselves because they aren't a size 2, or like most Hollywood actresses, a zero. Americans need to lose the obsession with weight and just work on being healthy.