Limitations
SHOP
This study has many strengths, including taking advantage of a fully functional online grocery store integrated into a commercial retailer that enabled seamless payment and delivery of a subset of purchases. However, it is not without limitations. Although we included a one-week washout period between shops and randomized the order of the conditions, we cannot rule out the possibility that these eliminated all possible carryover effects from one shop to another. A supplemental analysis that tested for ordering effect (see Supplementary Table A3 in Additional file 