When Prevention Editor-in-Chief Liz Vaccariello last dropped by to chat with Rachael, she outlined the phenomenally popular Flat Belly Diet. Now Liz is back with the scoop on her upcoming book that makes choosing the right foods a snap. "The 400 Calorie Fix was inspired by a column where we showed people how to eat four 400 calorie meals a day," she tells Rachael. "We show you how to eyeball foods, to read menus, so you're not counting calories, you are controlling it. It's the easiest weight loss solution ever because it's one simple rule: you learn to see the world through a 400-calorie lens."

Liz explains how they arrived at the 400 calorie figure. "We came up with that amount because registered dietitians say that's the amount in a meal that you're going to remain satisfied, you're not going to get cravings, you get a variety of tastes and textures and you're going to get enough disease-fighting nutrients so you stay healthy." The average American eats 2,700 calories a day, which is 1,000 more calories than a typical woman should be consuming daily. "It's no wonder [our weight] is creeping up!" she exclaims. Check out the gallery to the right to see specific examples of how the 400 Calorie Fix works at mealtime, and watch the video above to see how one woman lost six pounds in two days following the diet. Plus, read how Cassandra is doing today!

Only online! 400 Calorie Fix will be available in January, but you can read an excerpt from the book, and pre-order your copy here!

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400 Calorie Fix

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