No, it’s not science fiction, just an emerging field of real science that continues to amaze doctors, scientists, and just about everyone in the health care community. And at the heart of it all is something that can’t even be seen with the naked eye—the trillions of microscopic bacteria that have been living in your gut since the day you were born.

The human digestive tract is where more than 70 percent of the body’s natural immune defenses are found. That means it plays a vital role in preserving overall health, and study after study has shown that the good bacteria (called probiotics) can help prevent everything from digestive problems such as irritable bowel and constipation to inflammation-related conditions such as asthma and allergies. Not only that, but the variations between one person’s gut environment and the next can make a big difference when it comes to whether or not they are more prone to certain diseases or conditions throughout life.

While this comes as no surprise to natural health experts—who have been touting the benefits of probiotics and a balanced gut for years—their hope is that it will increase awareness about the benefits of taking a daily probiotic supplement at every age in order to promote lifelong health.