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Published at WebMD
You have many bacteria in your body. In fact, you have more of them than you have cells. Most are good for you. The ones found in your gut not only help you digest foods. They work all over your body and can be good for your physical and mental health.
In the gut microbiome, the “good” bacteria do more than just help with digestion. They help keep your “bad” bacteria in check. They multiply so often that the unhealthy kind doesn’t have space to grow. When you have a healthy balance of bacteria in your gut, it’s called equilibrium.
Your brain sends messages all over your body. Researchers believe your gut may talk back. Studies show that the balance of bacteria in the gut microbiome may affect your emotions and the way your brain processes information from your senses, like sights, sounds, flavors, or textures.
This is a very nice slide show with explanations published on WebMD.