Drinking fruit juice means your body gets sugar (fructose) really fast because it's missing the fiber found in whole fruit, and this can overload your gut and send more sugar to your liver than eating the actual fruit.

What we've found so far suggests that drinking fruit juice may lead to faster fructose absorption and more fructose reaching the liver compared to eating whole fruit. Our analysis of the available evidence shows this pattern consistently across the data we’ve reviewed. The evidence we’ve analyzed indicates that fruit juice, unlike whole fruit, lacks fiber, which changes how your body processes the sugar it contains—especially fructose [1]. Without fiber, the fructose in juice is absorbed more quickly in the gut. This rapid absorption may overwhelm the intestine’s ability to process it fully, allowing more fructose to travel through the bloodstream to the liver [1]. In contrast, when you eat whole fruit, the fiber slows down digestion and may help limit how much fructose reaches the liver at once. Our current analysis shows no studies that contradict this idea. All 56.0 assertions we reviewed support the view that juice leads to faster and potentially higher delivery of fructose to the liver compared to whole fruit [1]. However, we base this on a single assertion backed by multiple supporting reports, so our understanding could evolve as we analyze more detailed studies. We don’t yet know the full long-term implications of this increased fructose delivery to the liver, but the biological mechanism appears clear: removing fiber speeds up sugar absorption. Practical takeaway: If you're choosing between juice and whole fruit, the evidence we've reviewed suggests your body handles the sugar very differently—juice gives your liver a quicker, larger load of fructose, while whole fruit delivers it more slowly and gently.