Kelly Clarkson says a “thyroid issue” prompted her recent weight loss

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ABC/Image Group LAKelly Clarkson is revealing what prompted her recent slim-down — and it has nothing to do with hitting the gym.

Instead, she credits her weight loss to changing her diet after dealing with a thyroid issue.

“I literally read this book, and I did it for this autoimmune disease that I had and I had a thyroid issue, and now all my levels are back up,” she tells Extra. “I’m not on medicine anymore because of this book.”

The book she’s referring to is The Plant Paradox by Steven R. Gundry, MD.

“It’s basically about how we cook our food, non-GMO, no pesticides, eating really organic,” Kelly explains.

She adds, “I’m not working out! I think people think I’m working out and I’m like, ‘Don’t think I’m going to come play some sport!’”

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