Supermarket voluntary price promotion ban: a public health study

A public health evaluation of a voluntary ban on the use of price promotions to sell foods high in fat salt and sugar in two UK supermarket chains

Status

Recruiting

Phases

Unknown

Study type

Observational

Source

ISRCTN

Registry ID

ISRCTN23476580

Enrollment

Registered

2025-10-22

Start date

2025-09-01

Completion date

Unknown

Last updated

2025-11-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

The main focus of this work is the prevention of obesity and risk of chronic non-communicable diseases through reduction of consumption of high fat salt sugar foods. Other

Interventions

The study is a mixed-methods public health evaluation of a natural experimental policy. The project is structured into five interlinked work packages (WPs). WP1 will engage the public and policy maker

consumer purchases and food expenditure in aggregate and by sub-group) in comparison to controls using a longitudinal commercial dataset of household food purchases

findings will be triangulated with analysis in a second complementary commercial dataset (product sales dataset of loyalty card holders for one supermarket) that will also be used to explore industry

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Adults who shop at one or more supermarket in the UK and able to participate in an interview

Exclusion criteria

Exclusion criteria: Not meeting the key inclusion criteria

Design outcomes

Primary

Measure	Time frame
1.Change in purchase of foods (measured in Kcal per household) high in fat, salt and sugar (defined by the UK FSA-OFCOM model) amongst the Kantar World Panel at 12 and 24 months post-implementation 2.Change in total food expenditure (measured in GBP per household) amongst the Kantar World Panel at 12 and 24 months post-implementation	—

Secondary

Measure	Time frame
1. Modelled health, healthcare costs and socio-economic inequalities measured using the PRIMETime Model during the 30 years after implementation 2. Industry behaviour and economic performance (e.g. domestic turnover, employment, corporation tax, business rates; wages and salaries; pension contributions; and National Insurance contributions) measured using routinely available data (e.g. ONS Annual Business Survey) or published company reports in the 12 months post-implementation compared to the 12 months before implementation.	—

Measure

Time frame

1. Modelled health, healthcare costs and socio-economic inequalities measured using the PRIMETime Model during the 30 years after implementation 2. Industry behaviour and economic performance (e.g. domestic turnover, employment, corporation tax, business rates; wages and salaries; pension contributions; and National Insurance contributions) measured using routinely available data (e.g. ONS Annual Business Survey) or published company reports in the 12 months post-implementation compared to the 12 months before implementation.

—

Countries

England, Northern Ireland, Scotland, United Kingdom, Wales

Contacts

Public ContactOliver Mytton

o.mytton@ucl.ac.uk+44 020 7242 9789

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026