Somebody sue Weight Watchers already
"..no study has even been shown that losing weight from calorie restriction alone, or carbohydrate restriction, or fat restriction, or what have you improves health on a long-term basis. The vast majority of studies done show the exact opposite to such a degree that Weight Watchers should be panicked about being put under with a lawsuit of Biblical proportions.
Some, such as Paul Campos, Linda Bacon, Gina Kolata, Sandy Szwarc, myself and many others on the Duck Fiets bandwagon, have argued that the health risks normally associated with being obese are, for starters, grossly exaggerrated and in many cases bass ackwards – but most importantly the health problems associated with being obese appear to be from dieting, not the weight itself (in many studies dieting correlates more tightly with obesity than any other dietary or lifestyle factor). "
- Matt Stone of 180 Degree Health
http://180metabolism.com/blog/?p=61