Cleanses and fad diets are all the rage this time of year when people want a quick way to lose holiday weight. I tried a juice cleanse once. Sure I lost weight but then I gained it all back a week later. And my co-workers, friends and family nicknamed me Mr. Grumpy Pants. I learned the hard way: Cleanses and fad diets don't work on their own. But don’t take it just from me. I asked nutritionist Chrissy Wellington-Garner at Canyon Ranch In Lenox, Massachusetts, to tell me the truth about the most popular cleanses and to share one, if any, good takeaway from each.