OBJECTIVE: Assess the effects of a prototype computerized food portion tutorial (CFPT). DESIGN: Participants were randomly assigned to estimate portion sizes for selected food items either prior to or following CFPT training (between groups), and those estimating before CFPT training re-estimated portions after training (within groups). SETTING: Research offices. PARTICIPANTS: Seventy-six adult participants without dietary restrictions. INTERVENTION: The CFPT is a Web-based food portion training program that displays varied portions of 23 food items with user-controllable reference objects and viewing angles. MAIN OUTCOME MEASURES: Estimated vs. weighed portions of food items selected for a meal. ANALYSIS: Nonparametric tests were performed on estimated vs. weighed portion differences and on accuracy ratios between and within groups. RESULTS: A significant difference was found between conditions, both within and between groups, on the discrepancy between estimated and weighed portions for a number of the food items. Training exposure, however, resulted primarily in a shift from underestimation to overestimation, not more accurate estimation. IMPLICATIONS FOR RESEARCH AND PRACTICE: The CFPT produced a significant impact on food portion estimation but appeared to sensitize participants to underestimation errors, leading to overestimation errors. Computerization of food portion training programs holds promise for providing cost-efficient portion estimation training but requires further development and evaluation before being considered for clinical use.
RCT Entities:
OBJECTIVE: Assess the effects of a prototype computerized food portion tutorial (CFPT). DESIGN:Participants were randomly assigned to estimate portion sizes for selected food items either prior to or following CFPT training (between groups), and those estimating before CFPT training re-estimated portions after training (within groups). SETTING: Research offices. PARTICIPANTS: Seventy-six adult participants without dietary restrictions. INTERVENTION: The CFPT is a Web-based food portion training program that displays varied portions of 23 food items with user-controllable reference objects and viewing angles. MAIN OUTCOME MEASURES: Estimated vs. weighed portions of food items selected for a meal. ANALYSIS: Nonparametric tests were performed on estimated vs. weighed portion differences and on accuracy ratios between and within groups. RESULTS: A significant difference was found between conditions, both within and between groups, on the discrepancy between estimated and weighed portions for a number of the food items. Training exposure, however, resulted primarily in a shift from underestimation to overestimation, not more accurate estimation. IMPLICATIONS FOR RESEARCH AND PRACTICE: The CFPT produced a significant impact on food portion estimation but appeared to sensitize participants to underestimation errors, leading to overestimation errors. Computerization of food portion training programs holds promise for providing cost-efficient portion estimation training but requires further development and evaluation before being considered for clinical use.
Authors: Deborah J Toobert; Lisa A Strycker; Sarah E Hampson; Erika Westling; Steven M Christiansen; Thomas G Hurley; James R Hébert Journal: J Am Diet Assoc Date: 2011-10
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Authors: Shaun K Riebl; Allyson C Paone; Valisa E Hedrick; Jamie M Zoellner; Paul A Estabrooks; Brenda M Davy Journal: JMIR Res Protoc Date: 2013-10-22