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Start here if you want to understand what the gut microbiome is, why gut health matters and how your digestive system affects the rest of your body. These introductory guides explain the role of gut bacteria, microbial diversity, the gut–brain axis, the immune system and the connections between digestion, mood, skin and overall health.

You can also learn what kefir is, how traditional kefir is made and why fermented foods are often included in a gut-health routine. Each section combines a quick answer with a fuller explanation, useful facts, related questions, published research and practical product recommendations.

What Is the Gut Microbiome?

How Does Your Gut Affect the Rest of Your Body?

Why Does Your Gut Health Matter?

What Is Kefir?