What it entails: There are different versions of the diet, but the most popular is to eat 14 jars of baby food throughout the day in lieu of breakfast and lunch and then eat a normal dinner. Who does it:Reese Witherspoon and Marcia Cross have allegedly tried the diet. Advantages: Baby food is vitamin-packed and free of additives and those little jars don't require refrigeration. Also, if you think chewing is too much work, you're in luck. Disadvantages: Some jars of food are as low as 14 calories. It would take a lot more than 14 jars to get a healthy amount of calories for the day. Besides, it's bland, mushy and babies don't even like eating it. Why would you? The expert's opinion: "Glaringly the problem is that one of the cornerstones of trying to lose weight is that you want to eat bulky, chewy food that gives you a sense of satiety and satisfaction," nutrition expert Amy Hendel. "To just go to pureed food for reasons other than serious health issues or being a baby won't work. Nobody is going to sustain themselves on baby food."