Kelly Clarkson lost weight by following a diet based on the book "The Plant Paradox" by Dr. Steven Gundry. She has lost 37 pounds following this diet. The Plant Paradox diet is based on restricting gluten along with other types of "lectins" from your routine. Lectins are a type of protein that are present in foods such as nuts, vegetables, and fruits. Kelly Clarksons weight loss journey has been a topic of public interest, and she has been open about her struggles with weight gain, dieting, and weight loss. She has also been diagnosed with autoimmune and thyroid conditions, which led her to follow the Plant Paradox diet. Kelly Clarkson has never attributed her weight loss to exercise, but rather to her diet.