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Prebiotics, probiotics and your health

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You are what you eat. Or more accurately, you are what you feed the trillions of little critters that live in your gut.

The lining of your gut, like every surface of your body, is covered in microscopic creatures, mostly bacteria. These organisms create a micro-ecosystem called the microbiome. And though we don't really notice it's there, it plays an oversized role in your health and can even affect your mood and behavior.

Not surprisingly, what you feed your microbiome may have the biggest impact on its health. And the healthier it is, the healthier you are. The key to a healthy microbiome is nourishing a balance among the nearly 1,000 different species of bacteria in your gut.

There are two ways to maintain this balance — helping the microbes already there to grow by giving them the foods they like (prebiotic) and adding living microbes directly to your system (probiotic).