Too much weight loss?

Rachel Frederickson has been officially named as the "Biggest Loser" in the season's finale. When she came out, everyone was literally in shock at how unrecognizable she looked like. We think that losing 60% of her body mass or 155 pounds in 7 months is just a bit too much. Now the 24 year old looks like an anorexic and somewhat unhealthy woman. What do you guys think?