Normally you would only eat one orange. A glass of orange juice is equivalent to the juice of several oranges, with little or none of the accompanying fiber to slow down sugar absorption. Sure it's nutritious, but it's also a fructose bomb in a cup.
Fruit and vegetable consumption and all-cause mortality: a dose-response analysis http://www.ncbi.nlm.nih.gov/pubmed/23803880
Did I just blow your mind?
It may be interesting to note that I am a vegetarian so I am far from opposed to eating lots of fruit.
For comparison, Coca-Cola "original" has 26g sugar in 8oz (236ml).
Fruit juices are fruits with lots of the good stuff removed but I still consider fruits as desserts and not very healthy...
http://www.fda.gov/Food/GuidanceRegulation/GuidanceDocuments...
That doesn't mean that they aren't sweet, but the labeling should reliably state the fruit juice content.
Given that the blends aren't necessarily worse than the pure juice nutritionally, I'm not sure what you do for the consumer that can't tell the difference between "100% Vitamin C" and "100% Fruit Juice".
How can they say 100% apple juice with added ingredient (even if it is only vitamin C that they are adding in very small quantity...)
Maybe I'm misunderstanding, but why wouldn't fruits as desserts be healthy?
Fruit and vegetable consumption and all-cause mortality: a dose-response analysis http://www.ncbi.nlm.nih.gov/pubmed/23803880
For instance, apple and orange juice contains approximately 10 % sugar.
Juice drinks are then another matter; they are juice diluted with water and added sugar and flavourings, thus nutritionally even worse even though the sugar content is roughly similar.