Who doesn't want to wake up in the morning full of energy and feeling great? This is what makers of juice cleanses - or juice fasts - promise you: a "reset" for your body. Sounds enticing, especially at the start of a new year. There are pre-packaged juice plans with everything already mixed and instructions on when to drink what. Or if you're willing to put in the effort, you can save some money by switching on your juicer if you've got one. Are juice cleanses really beneficial to health? Two experts field some questions: How does a juice cleanse work? A simple juice cleanse - not to be confu...