I've previously had posts that pointed out that fruit juice was far from being a health food.
Mark Sisson explained some of the concerns the other day in an excellent post - Mark what's wrong with juicing?
The take-home message is this: juice can offer a decent source of nutrients on days when it’s hard to work in your usual amount of fruits and veggies, but it’s just not an adequate substitute for the real/whole source. (Note: It also requires that you recalibrate your overall carb load that day.)
Here is something else to consider:
Research presented at a US conference suggested a chemical in grapefruit juice could stop anti-allergy drugs being absorbed properly. A University of Western Ontario team said oranges, and possibly apples, had similar ingredients. Grapefruit juice is already known to interfere with blood pressure drugs.There are more details in a press release from the University of Western Ontario.