That's not the best, because everytime you change your program it starts you at the beginning. The programs are considering what areas were exercised each day and there are usually two lighter days, for stretching and mobility which are for your "rest" days.
Yes, that would be beneficial!
Avoid juices, but enjoy whole fruits. Bananas should be treated like a dessert, because they are very high in sugar.
I've read that it's sugar-free, gluten-free, and dairy-free, but that its made from sugar sources and its yeast.