Action planning to reduce skipping breakfast: Evidence from a Field Experiment

Last registered on January 14, 2022


Trial Information

General Information

Action planning to reduce skipping breakfast: Evidence from a Field Experiment
Initial registration date
January 14, 2022

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 14, 2022, 2:12 PM EST

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



Primary Investigator

University of Hyogo

Other Primary Investigator(s)

PI Affiliation
Tohoku Gakuin University
PI Affiliation
Kobe Gakuin University

Additional Trial Information

On going
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
We investigate whether action planning can reduce skipping breakfast. Skipping breakfast increases the risk of future diseases. This is common among young people. Preventing skipping breakfast will reduce the risk of future diseases. In this study, we will examine the action planning helps encourage people to take breakfast using a mobile health application. We evaluate whether app messages that create an action planning about breakfast in the next morning can reduce skipping breakfast.
External Link(s)

Registration Citation

Kurokawa, Hirofumi, Aiko Narumi and Shusaku Sasaki. 2022. "Action planning to reduce skipping breakfast: Evidence from a Field Experiment." AEA RCT Registry. January 14.
Experimental Details


Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Frequency of taking breakfast, Frequency of recording breakfast, Calorie intake
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Nutrients, Subjective health, Mental health
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We randomly assign individuals to a control group and one of two different treatment groups; incentivized food diary without making action plan group or incentivized food diary with making action plan group.
Experimental Design Details
The observation period is four weeks. In the first week, no intervention is given to any group. In the second and third weeks, financial incentives are provided for food diary in the two treatment groups. In this period participants in the treatment groups are asked to keep a food diary. Furthermore, in one of the treatment group (Action planning group), participants asked to make plan for breakfast for the next morning. In the other treatment group (No action planning group), participants are not asked to make the plan. In the fourth weeks, no intervention is given to any group. We will conduct follow-up surveys immediately after and one month after the end of the observation period.
Randomization Method
Stratified Randomization done by a computer. The strata are based on baseline frequency of taking breakfast.
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
Sample size: planned number of observations
300 individuals (at maximum).
Sample size (or number of clusters) by treatment arms
100 individuals in the incentivized food diary with making action plan group, 100 individuals in the incentivized food diary without making action plan group, and 100 individuals in the control group (respectively at maximum).
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
1) School of Economics and Management, University of Hyogo IRB
IRB Approval Date
IRB Approval Number
1) K2021-001
IRB Name
2) IRB for Kobe Gakuin University
IRB Approval Date
IRB Approval Number
2) HEB21-15
IRB Name
3) IRB for Kobe City Health Services
IRB Approval Date
IRB Approval Number
3) No.1516


Post Trial Information

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials