With quirky charm, rising science star Giulia Enders explains the gut's magic, answering questions like: Why does acid reflux happen? What's really up with gluten and lactose intolerance? How does the gut affect obesity and mood? Enders's beguiling manifesto will make you finally listen to those butterflies in your stomach: they're trying to tell you something important.

Gut feeling -- How does pooping work? And why that's an important question -- The gateway to the gut -- The structure of the gut -- What we really eat -- Allergies and intolerances -- A few facts about feces -- The nervous system of the gut -- How our organs transport food -- Reflux -- Vomiting -- Constipation -- The brain and the gut -- The world of microbes -- I am an ecosystem -- The immune system and our bacteria -- The development of the gut flora -- The adult gut population -- The role of the gut flora -- The bad guys: harmful bacteria and parasites -- Of cleanliness and good bacteria.