Methods: Observational panel data on purchases of fruit and vegetables and less-healthy foods/
beverages from 2010 were obtained for 24,879 households, stratified by occupational social class
(analyzed in 2014). Households’ supermarket choice was determined by whether they ever visited
market-defined high- or low-price supermarkets. Analyses also explored extent of use within
supermarket choice groups. Shopping behaviors included trip frequency, trip size, and number of
store chains visited.