I haven't watched the last few weeks, and I haven't watched tonight's finale' yet. Is Rachel the young woman who was a swimmer?
If that's her, then that is a drastic change. She looks older than she did before. How old is she?
When I was in my early-mid 20's I weighed 105, and I'm 5'4". I definitely wasn't "underweight". Maybe it depends on where and how you carry the weight?
At my age now (52), if I lost weight and weighed 105 again, I think I'd look sickly-thin.
Now I'm curious to watch tonight's episode...
But to answer your question, YES, I do think that in many cases, the Biggest Loser, whether the contestants on their own and/or with help from the show, goes too far. Especially since in the end, it's a contest to win money so that lends itself to "winning at any cost".