Dr. Kellyann Petrucci is the author of the New York Times bestselling book Dr. Kellyann's Bone Broth Diet, Dr. Kellyann's Bone Broth Cookbook, and The 10-Day Belly Slimdown. She also is the host of the PBS specials, 21 Days to a Slimmer, Younger You, and The 10-Day Belly Slimdown.