"Thin Mint" takes on a whole new meaning with the rising success of "the Cookie Diet," a rising fad that combines beloved baked goods with portion control. The diet—which Dr. Sanford Siegal invented in the 1970s but has recently become popular thanks to its availability on the Internet—provides followers with six pre-packaged cookies a day, plus one meal. Siegal estimates that as many as a half-million people have lost weight on his diet. He'll pocket around $18 million this year alone, thanks in part to celebrity disciples like Kim Kardashian and Jennifer Hudson. The diet's success relies on its ability to limit a person's daily intake to around 1,000 calories, but critics say that the diet is misleading and unlikely to really change behavior.