I've read a lot of negative reviews about the Flat Belly Diet, but this one incorporates all the bad stuff into one place:
http://www.medicinenet.com/script/ma...ticlekey=88098
There are good things about this diet, no questions: eating smaller meals, no expensive foods/powders to buy (goes towards affordability), eat good fats rather than bad ones, and increase proteins to feel fuller for longer. That's good, solid advice.
But- as with all "lose X pounds in Y days" programs, it's caveat emptor (buyer beware). These types of diets are for women who want to lose 5-10 pounds, not anything substantially more than that. Most of what you will lose will be water, along with some fat and some lean muscle (remember, your heart is a muscle). The dietary and exercise advice is questionable. You can't spot reduce. Eating monounsaturated fats will help reduce belly fat, but so will exercise and eating properly.