Richard C. Sadler|Andrew Clark|Piotr Wilk|Colleen O’Connor|Jason Gilliland
Using GPS and activity tracking to reveal the influence of adolescents’ food environment exposure on junk food purchasing
Michigan State University|Western University|Western University|Western University
objectives study examines influence adolescents exposure unhealthy food outlets junk food purchasing trips home school particular attention exposure purchasing differ according childs biological sex mode transportation direction school methods 2010 2013 students n 654 aged 913 years 25 schools london middlesex county completed sociodemographic survey activity diary identify food purchases observed via global positioning system 2 weeks track routes trips tofrom school spatial data routes purchase data integrated validated food outlet database geographic information system exposure measured minutes child spent within 50 unhealthy food outlet ie fast food restaurants variety stores trips involving junk food exposure n 4588 multilevel logistic regression used assess relationship exposure purchasing results multilevel analyses indicated adolescents duration exposure unhealthy food outlets home school significant effect likelihood junk food purchasing relationship remained significant data stratified sex femalemale trip direction tofrom school travel mode activecar exception adolescents travelled bus conclusion policies programs mitigate concentration unhealthy food outlets close schools critical encouraging healthy eating behaviours among children reducing dietrelated health issues obesity