title: Computer-based assessments of expected satiety predict behavioural measures of portion-size selection and food intake.
abstract: Previously, expected satiety (ES) has been measured using software and two-dimensional pictures presented on a computer screen. In this context, ES is an excellent predictor of self-selected portions, when quantified using similar images and similar software. In the present study we sought to establish the veracity of ES as a predictor of behaviours associated with real foods. Participants (N=30) used computer software to assess their ES and ideal portion of three familiar foods. A real bowl of one food (pasta and sauce) was then presented and participants self-selected an ideal portion size. They then consumed the portion ad libitum. Additional measures of appetite, expected and actual liking, novelty, and reward, were also taken. Importantly, our screen-based measures of expected satiety and ideal portion size were both significantly related to intake (p<.05). By contrast, measures of liking were relatively poor predictors (p>.05). In addition, consistent with previous studies, the majority (90%) of participants engaged in plate cleaning. Of these, 29.6% consumed more when prompted by the experimenter. Together, these findings further validate the use of screen-based measures to explore determinants of portion-size selection and energy intake in humans.
authors.affiliation: Nutrition and Behaviour Unit, School of Experimental Psychology, University of Bristol, 12a Priory Road, Bristol BS8 1TU, UK. Laura.Wilkinson@bristol.ac.uk
authors.forename: Laura L
authors.initials: LL
authors.lastname: Wilkinson
authors.forename: Elanor C
authors.initials: EC
authors.lastname: Hinton
authors.forename: Stephanie H
authors.initials: SH
authors.lastname: Fay
authors.forename: Danielle
authors.initials: D
authors.lastname: Ferriday
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Rogers
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Brunstrom
mesh_terms: D000328:Adult; D001066:Appetite; D003463:Cues; D004032:Diet / Q000523:psychology; D002149:Energy Intake; D005247:Feeding Behavior / Q000523:psychology; D005260:Female; D005518:Food Preferences / Q000523:psychology; D006801:Humans; D008297:Male; D057181:Pleasure; D015203:Reproducibility of Results; D012527:Satiation; D012528:Satiety Response; D012858:Size Perception; D012984:Software; D055815:Young Adult