Perception may be as important as reality when it comes to what constitutes a satisfying food portion, according to a new study from England. Subjects in the study, conducted by the University of Bristol, were more likely to describe themselves as satisfied when they thought the portions they were consuming were larger than they actually were. The study, reported at the annual meeting of the Society for the Study of Ingestive Behavior, raised the possibility that label verbiage like “light” or “diet” might have the opposite effect, driving consumers to eat more.