The 2017 NHS Health Scotland report Rapid evidence review: The impact of promotions on high fat, sugar and salt (HFSS) food and drink on consumer purchasing and consumption behaviour and the effectiveness of retail environment interventions provides an overview of the best available evidence on the impact of promotions on high fat, sugar and salt (HFSS) food and drink on consumer purchasing and consumption behaviour and the effectiveness of promotional interventions to influence consumer behaviour in a retail environment.