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Evaluation and comparison of the effectiveness of front-of-package labeling systems for pre-packaged and ultra-processed foods and non-alcoholic beverages in El Salvador

Effects of front-of-package nutrition labelling systems on objective understanding and purchase intention of food and non-alcoholic drink products in El Salvador: randomized controlled trial

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ISRCTN
Registry ID
ISRCTN12389597
Enrollment
1200
Registered
2023-07-17
Start date
2022-02-01
Completion date
Unknown
Last updated
2025-09-08

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

Conditions

Improvement on consumers' ability to correctly identify products with excessive amounts of sugars, fats, and sodium, to correctly identify the product option that is the least harmful to health, and to choose to purchase the least harmful choices or none of them options if they are all harmful. Other

Interventions

Allocation is random at equal rate (1/4) to four study groups (three experimental and the control group). The randomisation of the experimental conditions and groups was completed adopting a Williams

Sponsors

World Health Organization Regional Office for the Americas
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Adults residing in El Salvador aged 18 years old or older

Exclusion criteria

Exclusion criteria: 1. Visually impaired people 2. Persons unable to give informed consent 3. People who deny being part of this study

Design outcomes

Primary

MeasureTime frame
Measured by responses of participants to the stimuli in different experimental/control groups, and responses obtained from respondents by the interviewers by means of the application of a structured questionnaire after they were shown two-dimensional images of mock-up products: 1. The participant's decision to buy products 2. The correct identification of sugars, sodium and/or saturated fats found to be in excess in the products

Secondary

MeasureTime frame
Sociodemographic variables, including gender, age and education level by a structured questionnaire after seeing the mock-up products

Countries

El Salvador

Outcome results

None listed

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