A prominent attorney who lives in my neighborhood was recently found dead in his bed. He was 49 years old with no history of heart disease. He died from a heart attack. His teenage kids found him and performed CPR, but he was cold and long-gone by then. (Imagine the profound psychological trauma to this man's children.)

A close friend of the attorney told me that he'd passed an annual physical just two weeks earlier.

This sort of tragedy simply should not happen. It is easily preventable. Let...