Dr. Oz and Oprah look back at some of his most memorable moments. Poop questions, weight loss transformations and more! Plus, guests who say Dr. Oz saved their lives.

For many kids, being overweight takes a toll on both their health and their friendships. Watch 11-year-old weight loss guest Michaela discuss how her friendships changed as her weight did.

Former evangelical leader Ted Haggard's drug and sex scandal made national headlines. How has his life changed since his first interview on The Oprah Show?

Just before he turned 50, Southern chef Art Smith received an eye-opening diagnosis. What he did to reverse his diabetes.

On her final appearance on The Oprah Show, our most talked-about weight loss guest, Stacey Halprin, opens up about her new life, new love and future plans.