Overcoming budget, availability, and attention constraints to healthy diets in Tanzania

Last registered on January 09, 2024

Pre-Trial

Trial Information

General Information

Title
Overcoming budget, availability, and attention constraints to healthy diets in Tanzania
RCT ID
AEARCTR-0012786
Initial registration date
January 04, 2024

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
January 09, 2024, 10:47 AM EST

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Locations

Primary Investigator

Affiliation
Economic and Social Research Foundation

Other Primary Investigator(s)

PI Affiliation
Economic and Social Research Foundation
PI Affiliation
University of California, Irvine
PI Affiliation
Carleton University Department of Economics
PI Affiliation
International Food Policy Research Institute
PI Affiliation
Economic and Social Research Foundation
PI Affiliation
University of Zurich

Additional Trial Information

Status
In development
Start date
2024-01-15
End date
2024-04-15
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
This study is motivated by the problem of rapid rise in overweight, obesity, and non-communicable diseases in different parts of the World. The study assumes that if healthy food will also be conveniently available at affordable prices, chances are that food consumers will resort to eating healthier diets and minimize the consumption of unhealthy foods. The thrust of the research therefore is to test and evaluate the impact of price discounts on food consumption.
The first research problem is to understand the food environment in Dar es Salaam. This first component of the study involves two major parts namely desk study and fieldwork. The desk study involves making an in-depth understanding of situation analysis of food and nutrition in Tanzania and key dynamics around the world. The desk study involves also understanding the evolution of Tanzania policy in addressing the problem of hunger and malnutrition. The second component of the food environment study involves studying the kinds of unhealthy foods consumed in Dar es Salaam. This part of the study involves conducting interviews with food vendors and consumers of food with a purpose of understanding costs and non-cost barriers hindering households from the consumption of healthy foods. The fieldwork conducted for this component of the study also involved estimating price elasticities of demand for some heathy food options. This exercise is meant for collecting relevant data for informing the design of subsequent stages of the research especially the randomized control trial.
The second component of the research is a preference (discrete) choice experiment to learn about preferred attributes of food by consumers. The third component is a randomized control trial to test the effect of food subsidy program on consumption of healthy diets in the study location.
External Link(s)

Registration Citation

Citation
de Brauw, Alan et al. 2024. "Overcoming budget, availability, and attention constraints to healthy diets in Tanzania." AEA RCT Registry. January 09. https://doi.org/10.1257/rct.12786-1.0
Experimental Details

Interventions

Intervention(s)
Intervention Start Date
2024-01-15
Intervention End Date
2024-02-26

Primary Outcomes

Primary Outcomes (end points)
• To what extent does expanding access to healthy convenience increase the consumption of these items?

• Does providing vouchers for healthy convenience foods further increase the consumption of these products?

• Does providing vouchers to healthy convenience food crowd out expenditures to unhealthy substitutes?

• Does providing vouchers have a lasting impact on food consumption patterns?

• Does short-term intervention to catalyze consumer demand for healthy food affects vendors at the end of the intervention?
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
Coupon intervention. Random assignment of household to treatment and control, of which, the treatment group will be given coupon for six weeks.
Experimental Design Details
Randomization Method
Coupon intervention. Random assignment of household to treatment and control, of which, the treatment group will be given coupon for six weeks.
Randomization Unit
Household
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
1002 households
Sample size: planned number of observations
1002 households
Sample size (or number of clusters) by treatment arms
501 households in treatment and 501 in control. We will also include neighbor of treatment and neighbor of control to account for spill-over effects.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB

Institutional Review Boards (IRBs)

IRB Name
International Food Policy Research Institute
IRB Approval Date
0006-05-23
IRB Approval Number
MTID-22-0425P

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
No
Data Collection Complete
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials