Though whole grains can be beneficial for those with diverticulosis, refined grains are a different story. These grains have been stripped of their outer shell and most of their fiber, which can contribute to constipation and aggravate diverticulitis.
Foods made from refined grains include white bread, white rice, most types of pasta, and many types of breakfast cereal. They are easier to digest but lack the dietary fiber that is crucial for gut health. Long term, they can disrupt the balance of your gut flora and exacerbate diverticulosis symptoms.'

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