I don't watch it, but it was all over the internet this morning, so I've seen the pictures.
My opinion is this:
Yes, it is unhealthy. However, she likely will not stay there. What she did was go the extra mile to get small to win the prize. $250k, apparently. It was a CONTEST. Not a program to just get healthy. I think anyone bashing her should take a step back and look at the whole picture. If there's a problem, then it is created by the show, making the winner whoever loses the most (isn't that how it works?). So, unless every entrant is a woman with the exact same starting height and weight, it just isn't a fair contest from the start. She did what she needed to win. She's a competitor.
That said, she will probably (hopefully) gain a few pounds now that the contest is completed. She won. That was here goal at the end. If her only goal was to get healthy, she didn't need to enter a contest.
The problem I see, is that everyone standing on the sidelines is so critical. They're too fat. They're too skinny. They expect anyone who gives a hoot about themselves and their physical appearance to look PERFECT. So she wasn't perfect. They'd prefer her fat, instead? I don't get it. Double standard. It's ok to be fat, but not skinny?
And lets not forget, this was TV. By the end, she's essentially an actress. The same internet this morning was posting pictures of Mark Wahlberg talking about how much weight he put on (and lost/is losing) for the last movie he was in and his current one. He's an actor. She became an actress.
If it is amazing and "How did she do that?!" when an actress loses a ton of weight (or puts on 30 pounds in 2 months) for a movie role, or we obsess over how quickly they lost their baby weight and are back to washboard abs... why do we view this woman any differently? She essentially became an actress for this show. Unless she goes on to other acting roles that require her to lose/gain weight, I'd bet she balances out at a healthy weight in short order and goes on about her life, with an extra $250k in the bank.
Good for her.
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Oh.. and I also wanted to say that at what is she, 5'3" or something? 105 lbs isn't insane. I had a college roommate who was 5'7" and was like 108 lbs. Nobody said she was unhealthy. Everyone was jealous. And no, she was not anorexic. Just naturally thin. She didn't work out and she loved pizza and junk, just like the rest of us. She just had a crazy metabolism, loved to dance (recreationally,not as a class or exercise) and it was in her genes.
The BMI charts do not take into account body type. And if you look over the insurance charts from decades past (that's where these numbers came from originally---to see what sort of health risk you were to insure).. you'll see that they change, all the time. AND that they have always been way off in terms of what a "normal" person looks like.
Maybe we should be having this reaction over all the magazine covers and the models on them. Hmm?