Whole prunes have more fiber because the juicing process removes some.
According to Jow, the 'bottom line' is that both prune juice and dried prunes will help you go. If you prefer the taste of prune juice, you will still get the laxative benefits prunes provide, but whole prunes are a healthier choice, and you won't need as many servings to get the same amount of fiber and sorbitol.
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