Only Eight Percent Follow Restrictive Diets (e.g. Dukan, Atkins) Or Weight Control Programs (e.g. Jenny Craig, Weight Watchers)

Because they are starvation diets, stupid. (e.g., see here, here, here and here)

Despite all the recent hype, restrictive diets such as the Dukan Diet and Atkins - and dieting programs such as Jenny Craig or Weight Watchers - appear at the bottom of the list of popular weight control methods, according to a new national survey released this week by the Calorie Control Council (CCC).

They will never work, except infrequently in the short term.