Paula Abdul attends the 3rd Annual Dizzy Feet Foundation's Celebration Of Dance Gala on July 27, 2013 in Los Angeles. Photo credit: Paul A. Hebert/Getty Images.

Muscular Dystrophy weakens the muscles that move the body. More than a quarter million people live with the disease, according to the Muscular Dystrophy Association, and it's just one of many muscle-wasting diseases that can strike at any point in a person's lifetime.

ABC Health is joined today by pop star Paula Abdul, soap star Brandon Barash and Olympic gold medal gymnasts Nadia Comaneci and Bart Conner to talk about the fight against muscle-wasting diseases. The chat is hosted by ABC News's chief health and medical correspondent, Dr. Richard Besser.

To find out more about these diseases and what you can do to help, head on over to Twitter at 1 p.m., ET. You can take part in the conversation or simply see what the stars and the experts have to say about this important health topic.

Find out everything you need to know about the chat here. You can also follow along with the live blog below. If you're a mobile user click here.