Table 1.

PICOS criteria.

Criteria	Inclusion	Exclusion
Population	Studies that included and identified: type of food retail outlets (defined as an establishment primarily engaged in retailing a general line of food, e.g., cafeteria, grocery store); type of settings (e.g., food retail outlets located in hospital, university, school)	Food retail outlet such as farmers markets or food pantries. No exclusions were based on race, culture, ethnicity or geographical location of the food retail or retailers.
Intervention/exposure	Studies that aim to improve the healthiness of food purchased by consumers by altering factors such as price, promotion, placement	Studies that do not include a relevant intervention.
Comparator	No restrictions
Outcome	Studies reporting on implementation, sustainability and scalability of interventions implemented by food retailer(s) that aim to improve the healthiness of food purchased by consumers (see definitions in Table S3)	Studies that do not report a relevant outcome.
Type of Studies	Review studies (scoping, systematic, literature); English language published from inception to June 2020	All studies except reviews. Reviews summarising evidence from lab based or modelling studies.