Food

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Whole Grains
White or brown rice? Whole-wheat or white bread? Doctors say that if you want your gut to work better, choose whole grains, since optimal colon function requires at least 25 grams of fiber daily.

Compared to refined carbohydrates, like white bread and pasta, whole grains provide lots of fiber, as well as added nutrients, such as omega-3 fatty acids. When gut bacteria ferment fiber, they produce short-chain fatty acids. These molecules encourage proper function in the cells lining the colon, where 70 percent of our immune cells live.

Despite the popularity of low-carb diets for weight loss, avoiding grains altogether may not be so great for the good gut bacteria that thrive on fiber.