What are the 'secrets' behind weight-loss programmes?

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Question by Anteater: What are the 'secrets' behind weight-loss programmes?
I'm doing a piece of work where I have to evaluate the claims of two weight-loss programmes?
I am doing Slim-Fast and Pu-erh (a Chinese tea drink).

They are apparently all clinically-proven to help lose weight but there's always a catch. I need to write about that!
What could the problems with these two programmes be?

Help!


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