As many of you know, I am not a big fan of smoothies and juice cleanses. I think once in awhile sure it is ok to have either but for days on end, I don't recommend bypassing our first part of digestion which is rasa, taste and chewing. And no one needs 1 apple, 1 banana, 1 pear and one whatever all at once.
Attached please find a great article by one of my teachers Dr. Douillard on sugar: