Could you improve your health in three days? Some experts say yes, thanks to cleanses promising everything from increased energy to weight loss. But others say no, citing that your liver, kidneys and colon already do a fine job of cleaning out your system and there are no proven scientific benefits to downing only cold-pressed juices. So we formed a Cleanse Committee of staffers who swore off booze, caffeine and cooked foods to drink pounds of fruits and veggies. To find out if detoxes are worth the dollars, read on for the juicy details.