A lot of people believe fruit juices to be healthy. They must be… because they come from fruit, right? But a lot of the fruit juice you find in the supermarket isn’t really fruit juice. Sometimes there isn’t even any actual fruit in there, just chemicals that taste like fruit. What you’re drinking is basically just fruit-flavored sugar water. That being said, even if you’re drinking 100% quality fruit juice, it is still a bad idea. Fruit juice is like fruit, except with all the good stuff (like the fiber) taken out… the main thing left of the actual fruit is the sugar. If you didn’t know, fruit juice actually contains a similar amount of sugar as a sugar-sweetened beverage

Kris Gunnars, Business Insider