Amy F. Subar|Jennifer L. Crafts|Thea Palmer Zimmerman|Michael Wilson|Beth Mittl|Noemi Islam|Suzanne McNutt|Nancy Potischman|Richard Buday|Stephen G. Hull|Tom Baranowski|Patricia M. Guenther|Gordon Willis|Ramsey Tapia|Frances E. Thompson
Assessment of the Accuracy of Portion Size Reports Using Computer-Based Food Photographs Aids in the Development of an Automated Self-Administered 24-Hour Recall
National Cancer Institute
assess accuracy portionsize estimates participant preferences using various presentations digital imagestwo observational feeding studies conducted participant selected consumed foods breakfast lunch buffet style serving portions nine foods representing five forms eg amorphous pieces serving containers weighed unobtrusively selection plate waste next day participants used computer software program select photographs representing portion sizes foods consumed previous day preference information also collected study 1 n29 participants presented four different types images aerial photographs angled photographs images mounds household measures two types screen presentations simultaneous images vs empty plate filled images food portions clicked study 2 n20 images presented two ways varied size large vs small number 4 vs 8convenience sample volunteers varying background office settingrepeatedmeasures analysis variance absolute differences actual reported portions sizes presentation methodsaccuracy results largely statistically significant indicating one image type accurate accuracy results indicated use eight vs four images accurate strong participant preferences supported presenting simultaneous vs sequential imagesthese findings support use aerial photographs automated selfadministered 24hour recall food forms images mounds household measures accurate images food therefore costeffective alternative photographs foods