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I don't think you can draw meaningful conclusions from a self-enforced system like Weight Watchers either though. Self reporting particularly when it comes to a

by sohex 8y ago

I don't think you can draw meaningful conclusions from a self-enforced system like Weight Watchers either though. Self reporting particularly when it comes to anything diet related is going to be heavily skewed. There will always be social pressures within a group like that to over report exercise and under report intake.

falcolas 8y ago
If you can't trust the results of a self-selected group of individuals who are paying a good chunk of cash for the express purpose of loosing weight... who the hell can you trust?
- sohex 8y ago
  Generally speaking you're absolutely right, but with diet the social pressures are significant enough to compromise analysis even if the group is paying for it. There have been quite a few studies on the topic, e.g.: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.1031.9343&rep=rep1&type=pdf http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.103...