Choice BehaviorNCT06554743
Plant-Based Defaults
A study testing Default Veg and Default Meat in people with Choice Behavior and Dietary Habits, run by Arizona State University at 1 site in United States.
Trial summary
In this study, participants at six different academic events were randomly assigned to one of two conditions: (1) a default meat group, where the default choice was a meal with meat and participants had the option of opting out and choosing a plant-based meal; and (2) a default veg group, where the default choice was… Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Choice Behavior, Dietary Habits
- What is being tested?
- Default Veg and Default Meat
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 365 participants
- Where
- 1 siteUnited States
- Study dates
- 1 Mar 2022to 22 Feb 2024
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Academic event attendee
Who cannot join
- None
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Using Defaults to Reduce Harmful Environmental Impacts
In this study, participants at six different academic events were randomly assigned to one of two conditions: (1) a default meat group, where the default choice was a meal with meat and participants had the option of opting out and choosing a plant-based meal; and (2) a default veg group, where the default choice was a plant-based meal with the option of opting out and choosing a meal with meat. Based on the success of prior studies that implemented plant-based defaults through preselection, we hypothesized that more participants would choose the plant-based meal when that option was set as the default, and we hypothesized that the default intervention would be equally effective across academic institutions. We also hypothesized that the default intervention would be equally effective across demographic groups, which would help to further demonstrate the generalizability of our plant-based default intervention.
- Conditions
- Choice Behavior, Dietary Habits
- Being tested
- Default Veg, Default Meat
- Medical subject headings
- Feeding Behavior
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Default VegBehavioural
Received a plant-based meal as the default option on the event RSVP form that required participants to pre-select their meal choice
Default MeatBehavioural
Received a meal with meat as the default option on the event RSVP form that required participants to pre-select their meal choice
| Study group | Role | What they receive |
|---|---|---|
| Default Veg | Experimental | Received a plant-based meal as the default option on the event RSVP form that required participants to pre-select their meal choice Receives: Behavioral: Default Veg |
| Default Meat | Active comparator | Received a meal with meat as the default option on the event RSVP form that required participants to pre-select their meal choice Receives: Behavioral: Default Meat |
What is being measured
The primary outcome is the main question the study is designed to answer.
Proportion of participants selecting the plant-based meal
The percent (%) of participants selecting the plant-based meal option instead of the meal with meat option on the event RSVP from
Measured: Immediately during the completion of the event RSVP form
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted15 Aug 2024
- Study start1 Mar 2022
- Primary completion12 Aug 2022
- Study completion22 Feb 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Choice BehaviorStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Participant
- Enrolment
- 365 participants (actual)
Sponsor and investigators
- Lead sponsor
- Arizona State University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Chad Stecher@asu.edu, Arizona State University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06554743
- Sponsor's protocol ID
- STUDY00016889
- Status last verified
- Jul 2025
- First submitted
- 29 Jul 2024
- Last updated
- 15 Jul 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: De-identified study will be share through the ASU Research Data Repository
Publications
Zhang AW, Wharton C, Cloonan S, Boronowsky R, Magesh V, Braverman I, Marquez A, Leidy H, Wang MC, Cleveland DA, Jay J, Stecher C. Changing the default meal option at university events to reduce harmful environmental impacts: Six randomized controlled trials. Appetite. 2024 Sep 1;200:107572. doi: 10.1016/j.appet.2024.107572. Epub 2024 Jun 20.
PubMed 38908405
Study at a glance
From the registry record, last updated by the sponsor on 15 Jul 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Using Defaults to Reduce Harmful Environmental Impacts
- ClinicalTrials.gov ID
- NCT06554743
- Acronym / sponsor ID
- STUDY00016889
- Conditions
- Choice Behavior, Dietary Habits
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 365 participants (actual)
- Lead sponsor
- Arizona State UniversityUniversity, hospital or other
- Study start
- 1 Mar 2022 (actual)
- Primary completion
- 12 Aug 2022 (actual)
- Study completion
- 22 Feb 2024 (actual)
- First posted
- 15 Aug 2024 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
In this study, participants at six different academic events were randomly assigned to one of two conditions: (1) a default meat group, where the default choice was a meal with meat and participants had the option of opting out and choosing a plant-based meal; and (2) a default veg group, where the default choice was a plant-based meal with the option of opting out and choosing a meal with meat. Based on the success of prior studies that implemented plant-based defaults through preselection, we hypothesized that more participants would choose the plant-based meal when that option was set as the default, and we hypothesized that the default intervention would be equally effective across academic institutions. We also hypothesized that the default intervention would be equally effective across demographic groups, which would help to further demonstrate the generalizability of our plant-based default intervention.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (participant)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Default Veg | Experimental | Behavioral: Default VegReceived a plant-based meal as the default option on the event RSVP form that required participants to pre-select their meal choice |
| Default Meat | Active comparator | Behavioral: Default MeatReceived a meal with meat as the default option on the event RSVP form that required participants to pre-select their meal choice |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- Academic event attendee
Key exclusion criteria (1 listed)
- None
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Default VegReceived a plant-based meal as the default option on the event RSVP form that required participants to pre-select their meal choice | Behavioural | Default Veg |
| Default MeatReceived a meal with meat as the default option on the event RSVP form that required participants to pre-select their meal choice | Behavioural | Default Meat |
Primary outcome
Proportion of participants selecting the plant-based meal
Time frame: Immediately during the completion of the event RSVP form
The percent (%) of participants selecting the plant-based meal option instead of the meal with meat option on the event RSVP from
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 15 Jul 2025.
- Results publication: PubMed 38908405Zhang AW, Wharton C, Cloonan S, Boronowsky R, Magesh V, Braverman I, Marquez A, Leidy H, Wang MC, Cleveland DA, Jay J, Stecher C. Changing the default meal option at university events to reduce harmful environmental impacts: Six randomized controlled trials. Appetite. 2024 Sep 1;200:107572. doi: 10.1016/j.appet.2024.107572. Epub 2024 Jun 20.
- Individual participant dataSharing planned: Yes. De-identified study will be share through the ASU Research Data Repository
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Default Veg and Default Meat in people with Choice Behavior and Dietary Habits, run by Arizona State University at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 15 Jul 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Proportion of participants selecting the plant-based meal (time frame: Immediately during the completion of the event RSVP form). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT06554743, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Jul 2025.