Kotb wasn't going to let that one go without further inquiring, "What's the secret? We want to know," to which Kelly responded honestly, "I read this book that was given to me years ago, and I was just like, 'Whatever, another book,' because I had this autoimmune disease and a thyroid problem. I read this book called The Plant Paradox, and it might not work for everyone; it worked for me."
Was weight loss a side effect? Yep. "Thirty-seven pounds," Clarkson revealed to a noticeably shocked Kotb. "That's not even the best part: I mean, I know the industry loves the weight gone, but for me, I am not on my medicine anymore. I haven't been on my medicine since February."
In reference to her diet, Clarkson said what she eats hasn't changed, but the ingredients have. "It's understanding what we do to food, like spraying and pesticides and genetically modified and hormones we pump in. It [The Plant Paradox] is also about how pharmaceuticals have ruined our body. I don't take medicine unless I absolutely need it."
On Thursday, Extra published an interview with the original American Idol winner, in which she reiterated: "I'm not working out! I think people think I'm working out and I'm like, 'Don't think I'm coming to play some sport!'"
Clarkson recently announced she will be returning to The Voice season 15 in the fall, alongside fellow Idol alum Jennifer Hudson.
See the Today clip below: