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The Baby Food Diet: This diet, winning points for having the most self-explanatory title, has been a trend for Hollywood moms like Reese Witherspoon and Marcia Cross. It's pretty much exactly what you'd think: Eating baby food in lieu of real food. The small portions help curb overeating and nutritional content helps avoid malnourishment (hear that, actresses?). While ice cream cones aren't quite on the list of approved options, if you work out the way Reese does, you can go ahead and graduate to a kindergartner's diet.