Clarkson, 36, has always been an advocate for positive body image, no matter her size. But the star, who said she was diagnosed with a thyroid condition in 2006, also recognized that, after dropping 37 pounds following the advice in Dr. Steven Gundry’s book The Plant Paradox, she feels better than ever. “Here’s the best part, y’all,” the former yo-yo dieter said on the Today show in June 2018. “It’s not even the weight. I mean, I know the industry loves the weight gone, but for me it wasn’t really the weight, for me it was [that] I’m not on medicine anymore.”
Scroll through to see photos of the happiest, healthiest Clarkson yet on season 15 of the NBC hit.