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Poor choice of control

Giving the control group a sachet with a neutral substance would have been a better control. Subjects with the sachet may have gotten a psychological boost that led to small changes in their daily routine (e.g. walking more, eating less), or simply drinking 3 extra glasses of liquid may have reduced their appetite and therefore led to weight loss.
I wouldn't put much stock in these results.

Posted by J Kellogg
24 August 2012 | 17h49

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