Season 15 of the Biggest Loser wrapped up last night, and the live finale created a firestorm on Twitter when finalist Rachel Frederickson came out looking frighteningly thin.

The 5'5" 24-year-old dropped from 260 lbs at her initial weigh-in to a shocking 105 lbs. at last night's finale. That weight gives her a BMI of 17.5. Anything under 18.5 is considered underweight.

Biggest Loser contestant Rachel Frederickson before and after her weight loss. (NBC)

***SPOILER ALERT***

Just in case:

***SERIOUSLY BIG GIANT DON'T YELL AT ME SPOILER ALERT***

Rachel wound up winning the show's $250,000 grand prize, losing the highest percentage of weight (nearly 60%!!!)

I watched the whole season of the show, and Rachel was one of my favorites the entire time, and I was pulling for her to win.

Unfortunately, she went from looking amazing and healthy on the last episode at the ranch to gaunt and sickly at the live finale. At one point she tripped up the steps to the scale and I genuinely thought she was going to hurt herself by falling.

Even the trainers looked concerned when Rachel originally walked out. Their normal smiles and hugs were exchanged for looks of shock.

Bob Harper and Jillian Michaels react to Rachel's weight loss. (NBC)

Part of me hopes that Rachel took her weight from one extreme to the other just to win the show and that she will gain enough weight back to be healthy.

NBC has yet to address the situation, but they absolutely should. Some have suggested that the show's producers should disqualify contestants if they reach an unhealthy weight. Others have questioned why no one was monitoring Rachel as she continued to lose weight beyond her target.

Still others thought she looked great. (What that says about our society is a whole other issue.)

I love the show, but this seems to be a clear turning point for seasons to come. Maybe the show should focus on becoming the healthiest loser, rather than the biggest.

Do you think the show should address this? Tell us in the comment section below!