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Juice sits in a strange spot at the grocery store. It’s marketed as a wholesome breakfast staple and a wellness shortcut, yet nutrition experts keep flagging the same problems around sugar and blood glucose. So what is juice really doing for your body, and when is it worth reaching for?
The short answer from dietitians and doctors is that 100% fruit and vegetable juices deliver real nutrients, but they also come with real trade-offs that most marketing skips over.
How juice stacks up nutritionally
100% fruit and vegetable juices are rich in vitamins and minerals. Orange juice provides vitamin C, folate and potassium. Grapefruit juice offers vitamin C and potassium. Pomegranate juice contains potassium and small amounts of vitamin K. Prune juice delivers potassium and some vitamin K as well.
Juice also retains many of the phytochemicals found in whole fruit, including flavonoids, polyphenols, anthocyanins (especially in grape and cherry juice) and carotenoids (especially in orange juice).
Because it’s mostly water, juice contributes to daily hydration while providing nutrients that plain water doesn’t. Registered dietitian Amy Davis, RDN, told Real Simple that “Orange juice is famously known to be a great source of vitamin C, providing over 100 percent of the daily recommended intake for adults in an eight ounce serving.”
Vegetable juice earns similar praise. “Carrot juice provides an excellent amount of immunity-helping vitamin C,” Amy Gorin, M.S., R.D.N., owner of Plant-Based with Amy in New York City, told Prevention.
Why fiber matters and juice falls short
The biggest catch with juice is what’s missing. Davis noted that orange juice is “considered high in calories and sugar, with 110 calories and 21 grams of sugar (even if it is naturally-derived) in 8 ounces,” and pointed out that it is very low in fiber compared to the whole fruit.
That missing fiber matters more than it sounds. According to Katey Davidson, writing for Healthline, “Unlike whole fruit, fruit juice is low in fiber. During processing, the juices are extracted from the fruit, and the remaining flesh and fiber are discarded. Fiber helps manage your blood sugar levels by slowing the absorption of sugar into your bloodstream. Without fiber, sugar can easily enter your blood and lead to a rapid spike in blood sugar and insulin.”
Which juices are gentler on blood sugar
Not every juice hits your bloodstream the same way. In an article for Health, C. Vivek Lal, M.D., the director of clinical innovation at Heersink Institute of Biomedical Innovation, explained the difference. “We will often see clear juices, like grape and apple juice, spike blood sugar more, while the more pulpy juices, such as orange and grapefruit juice, and veggie-forward juices, have a gentler effect.”
The takeaway isn’t that juice is bad. It’s that whole fruit almost always wins on fiber, and when you do pour a glass, pulpy or vegetable-forward options tend to be the smarter pick.
This article was created by content specialists using various tools, including AI.
