Childhood obesity is becoming a dangerous health concern in the United States, and Dr. Oz says as much as doctors and parents want to help children, influential young people, like rapper Lil' Mama, may be have more power when it comes to curbing the epidemic.

Dr. Oz talks with Lil' Mama, who was born in 1989 as Niatia Jessica Kirkland, about her effort to go into neighborhoods and talk with young people about eating healthy. Plus, Lil' Mama talks about how being the oldest daughter of eight siblings earned her her nickname and how her mother's death from colon cancer has made her passionate about promoting health and wellness.