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

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

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN17707440

Enrollment

3600

Registered

2023-07-10

Start date

2023-07-17

Completion date

Unknown

Last updated

2025-10-27

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

The randomisation of the experimental conditions and groups is completed by adopting a Williams design to ensure the order of categories of products and the order of products within categories was ran

the only difference across groups is the front-of-package labelling (FOPL) scheme they feature. Mock-ups shown to participants feature solely one of the following FOPL schemes tested, according to the

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Adult supermarket shoppers 2. Residing in Bolivia 3. 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 4. People who do not meet the inclusion criteria

Design outcomes

Primary

Measure	Time frame
Contribution of the different front-of-package labeling (FOPL) schemes to improving the decision of participants to buy the least harmful option more often, the selection of the least harmful option more often and the correct identification of sugars, sodium and/or saturated fats found to be in excess in the products more often, measured comparing correct responses of participants to the stimuli in different experimental/control groups at one timepoint	—

Measure

Time frame

Contribution of the different front-of-package labeling (FOPL) schemes to improving the decision of participants to buy the least harmful option more often, the selection of the least harmful option more often and the correct identification of sugars, sodium and/or saturated fats found to be in excess in the products more often, measured comparing correct responses of participants to the stimuli in different experimental/control groups at one timepoint

—

Secondary

Measure	Time frame
The impact of sociodemographic variables, such as gender, age, and education level, on the differences observed in the performance of various front-of-package labeling schemes. This assessment was measured by administering a structured questionnaire to respondents after they were shown mock-up products and provided their responses. The questionnaire captured their opinions and perceptions of the labeling schemes at one timepoint. The goal was to determine the extent to which sociodemographic factors contribute to the variations observed in the respondents' evaluations of the labeling schemes.	—

Measure

Time frame

The impact of sociodemographic variables, such as gender, age, and education level, on the differences observed in the performance of various front-of-package labeling schemes. This assessment was measured by administering a structured questionnaire to respondents after they were shown mock-up products and provided their responses. The questionnaire captured their opinions and perceptions of the labeling schemes at one timepoint. The goal was to determine the extent to which sociodemographic factors contribute to the variations observed in the respondents' evaluations of the labeling schemes.

—

Countries

Bolivia

Contacts

Public ContactFabio Da Silva Gomes

gomesfabio@paho.org+1(202)9743695

Outcome results

None listed

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