Prunes are widely known as a good source of dietary fiber, which helps normalize blood sugar levels by slowing the rate at which food leaves the stomach and by delaying the absorption of glucose (the form in which sugar is transported in the blood) following a meal. Soluble fiber also increases insulin sensitivity and can therefore play a helpful role in the prevention and treatment of type 2 diabetes. Also prunes' soluble fiber promotes a sense of satisfied fullness after a meal by slowing the rate at which food leaves the stomach, so prunes can also help prevent overeating and weight gain.
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