Comparing Online and In-Store Grocery Purchases
2021
Zatz, Laura Y. | Moran, Alyssa J. | Franckle, Rebecca L. | Block, Jason P. | Hou, Tao | Blue, Dan | Greene, Julie C. | Gortmaker, Steven | Bleich, Sara N. | Polacsek, Michele | Thorndike, Anne N. | Rimm, Eric B.
To describe the grocery shopping patterns of people who shopped both online and in-store and evaluate whether shoppers purchased fewer unhealthy, impulse-sensitive items online.Secondary analysis of 44 weeks of grocery transaction data collected for fruit and vegetable incentive trials in 2 Maine supermarkets.A total of 137 primary household shoppers who shopped at least once in-store and online (curbside pickup) for 5,573 total transactionsPaired t tests and descriptive analyses compared online and in-store transactions with respect to frequency, total spending, number of items purchased, and spending on 10 food groups and 34 subgroups. Mixed-effects regression models estimated differences in online vs in-store spending on 5 unhealthy, impulse-sensitive subgroups.When shopping online, participants spent 44% more per transaction ($113.58 vs $78.88, P < 0.001) and purchased more items (38.3 vs 26.6 items/transaction, P < 0.001). Compared with in-store, shopping online was associated with reduced spending per transaction on candy (−$0.65, P < 0.001), cold or frozen desserts (−$0.52, P < 0.001), and grain-based desserts (−$1.29, P < 0.001).Online shopping was associated with lower spending on certain unhealthy, impulse-sensitive foods. Grocery-based healthy eating initiatives might leverage online ordering platforms to increase their reach and effectiveness.
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