ALS, often referred to as Lou Gehrig's disease, is a rare disorder that affects a person's nerves and muscles, leading to paralysis and death within a few years.
Most people with ALS are between 40 and 70 years old -- in the prime of their lives.
While there's no cure, researchers are learning more and more about this deadly disease.
In this segment, Dr. Roizen welcomes Piera Pasinelli and Davide Trotti, co-directors of the Weinberg Unit for ALS Research. They share the latest on how the disease develops and how doctors might be able to fight it.