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It’s hardly news that the gastrointestinal tract is important to human health: It transports food from the mouth to the stomach, converts it into absorbable nutrients and stored energy, and shuttles waste back out of the body. If you don’t properly nourish yourself, you don’t live. It’s that simple. But in recent years, scientists have discovered that the GI system has an even bigger, more complex job than previously appreciated. It’s been linked to numerous aspects of health that have seemingly nothing to do with digestion, from immunity to emotional stress to chronic illnesses, including cancer and Type 2 diabetes. Research on the microbiome is still in its infancy. But studies have already found that certain environments, foods and behaviors can influence gut health for better or worse. Here’s why that matters and what you can do to improve yours. Why is gut health important? Everyone’s microbiome is unique, but there are a few generalities about what’s healthy and what’s not....