It's way more than a dollar pound.
Figures from the late 1990?s showed that Americans spent $50 billion annually on diet products.7 This exceeds the projections for the entire federal Education, Training, Employment and Social Services budgets by five to ten billion dollars.8 In fact, this figure is the equivalent of the gross national product of Ireland.9 The price per pound lost is enormous, with one study of Optifast dieters reporting the cost to be $180 per pound.10 "
http://www.bodypositive.com/wtloss.htm
JayR