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Sure, juice technically comes from fruit, but it leaves behind the best parts of the produce. Essentially, juice is the sugar and water from the fruit without any of the fibre, and fiber is the component that slows calorie absorption and blunts the effect of carbohydrates. So, even if it’s 100% natural with no added sugar, fruit juice is a recipe for a big spike in blood sugar, and should really only be used to quickly bring glucose levels up in cases of hypoglycemia. Stick with a glass of water with a piece of juicy, high-fiber fruit on the side.