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Forget About Your Stomach

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3. Your small intestine has moods. You can actually keep your small intestine healthy and happy. Yes, happy. It contains as many neurons as your spinal column. In many ways, the small intestine is like a second brain. Ninety-five percent of your serotonin — the brain's mood-regulating chemical — is contained in your small intestine's elaborate network of nerves. That's a big reason why we feel strong emotions like fear, anticipation, and love deep in our guts as well as our minds. The intestine's nerves can also suffer from the same diseases that affect the brain. A lack of adequate serotonin in the gut can cause an irritable bowel, just as low levels in the brain can cause depression.

 

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