Have you ever noticed that some people reach their 80s, 90s, and even 100 years old and are still active, engaged, sharp, and enjoying life, while others struggle many decades earlier?

What is their secret?

Is it genetics? Is it luck? Is there some special supplement they've discovered?

As it turns out, the answer is probably much simpler—and much more encouraging—than you might think.

Today we're beginning a conversation about longevity and one of the most fascinating discoveries in aging research: the possibility that periods of fasting may help activate some of the body's natural repair and renewal systems.