It's every snack cravers dream diet: eat cookies all day and still lose weight. Jennifer Hudson co-signs on it. So does Kelly Clarkson. Dr. Sanford Siegel's Hollywood Cookie Diet is the hottest (and best-selling) diet craze of 2009.

The premise is simple: eat six 90-calorie cookies a day and a 500-calorie meal for dinner. Except, nutritionists aren't advising we dip into the cookie jar just yet, citing that a diet so low in calories is just another half-baked quick fix.

Sound familiar? The experts aren't saying anything we haven't heard before. Read on for more memorable fad diets we surely tried through the years.

Check out more fad diets everyone knew were too good to be true