(InvestigateTV) — Maybe you’ve heard about a smoker who never exercised and is living happily into old age. Perhaps a runner who had a heart attack at the age of 45.

It may make you wonder, is your well-being simply written into your genes?

In this Medical Myth Buster, Medical reporter Viv Williams explores the roles, genetics and the environment play in your health.

Copyright 2025 Gray Media Group, Inc. All rights reserved.