You might have noticed -- talking about gut health and good bacteria is all the rage right now.

Everywhere you look, you see it: probiotics, probiotics, kombucha, fermented foods, and more...

And it's for good reason.

We are covered in and contain billions and billions of bacteria. And while we're still only scratching the surface of understanding what they do, it seems that they have a major influence on everything from development and even behavior, to the diseases we get and how we fight them.

In essence, our body's normal bacteria play a big part in helping us be us.

To help shed some light on all of these nuances, I spoke with Dr. Will Bulsiewicz, who is perhaps best known as 'The Gut Health MD.'