Nail, Levy, Russin, and Crandall (this issue) report a failure to replicate the Rodin time estimation/obesity study. Their study and conclusions provide the basis for comments regarding the problem with viewing obesity as a homogeneous disorder, and thereby making inadvertent sampling errors by dividing groups on the basis of weight alone. The current status of the internality and externality hypothesis is also briefly considered, with suggestions regarding directions for future research.
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