You've likely heard a lot about gut health lately. Or maybe your “microbiome” or “gut flora” or the importance of probiotics. That's because it's now understood that the balance of microorganisms that live in our digestive tract is absolutely vital for everything from physical and mental health to overall immunity and more. Gut health isn't about “being regular.” It's about looking and feeling your best while maintaining optimal health. Here's what you need to know and what you need to do.