The process of juicing fruits concentrates the sweetness, which will bring in too much sugar into the body, upset the acid - alkaline balance of the body, and lead to mineral deficiencies. (tracyhuang.me)
and in many cases are also soaked in juice fruit to soften the grains and then further toasted (with more fat and sugar being added). (fitbodyhq.com)
Since juicing fruit removes most of its fiber, it doesn't keep you as full as a whole orange or apple might. (businessinsider.com)