Correction to: Nature Human Behaviour https://doi.org/10.1038/s41562-019-0642-2, published online 12 June 2019.

In the version of this article initially published, the editorial incorrectly stated that there was a 35% increase in healthy purchases rather than health profile. The 35% improvement comprises a 31% reduction in junk food purchases and a 160% increase in healthy purchases (the increase in healthy purchases was large, in percentage terms, because the pre-intervention rate of healthy purchases was very small). The error has been corrected in all versions of the article.