How Much Have You Spent on Diets?

How much have you spent to try to lose weight?

This week, "20/20? will take a revealing look at the weight loss industry, including books, diet plans and diet programs that can charge hundreds of dollars a month or more. We wanted to hear from you: Have you spent money on diets? How much? Vote below and watch "Losing It: The Big Fat Money Pit" Friday at 10 p.m. ET.