'Welcome to Chasing Life. You know, one of the biggest fears people have, especially as they get older, is that they're going to lose their brain function. They're not going to be as sharp as possible ...

CNN — Editor’s note: The podcast Chasing Life With Dr. Sanjay Gupta explores the medical science behind some of life’s mysteries big and small. You can listen to episodes here. (CNN) — If you are like ...