Documentary to Encourage Plant-based Eating
Study Details
Study Description
Brief Summary
This study will assess whether watching a documentary video about the health, environmental, and ethical consequences of eating meat and animal products reduces participants' self-reported intake of these items.
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
N/A |
Detailed Description
See detailed preregistration: https://osf.io/xrckh/registrations
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| Experimental: Intervention See detailed preregistration: https://osf.io/xrckh/registrations |
Behavioral: Documentary
A 20-minute documentary about the health, environmental, and animal welfare consequences of eating meat and animal products
|
| Sham Comparator: Control See detailed preregistration: https://osf.io/xrckh/registrations |
Behavioral: Control
A 20-minute unrelated video (a motivational talk entitled "Listening to shame")
|
Outcome Measures
Primary Outcome Measures
- Total meat and animal product consumption [Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection]
Self-reported meat and animal product consumption (ounces consumed over the past week)
Secondary Outcome Measures
- Total meat consumption [Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection]
Self-reported meat consumption (ounces consumed over the past week)
- Total animal product consumption [Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection]
Self-reported animal product consumption (ounces consumed over the past week)
- Consumption of each of 8 individual categories of meats and animal products [Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection]
Self-reported consumption (ounces consumed over the past week)
- Total consumption of selected, healthy plant-based foods (ounces consumed over the past week) [Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection]
Self-reported consumption (ounces consumed over the past week)
Other Outcome Measures
- Perceived importance of health [2 weeks after baseline data collection]
A single Likert item adapted from Heckler (2010), ranging from 1 to 6, with higher scores representing greater perceived importance. The exact text is provided in detailed preregistration: https://osf.io/xrckh/registrations.
- Perceived importance of environmental sustainability [2 weeks after baseline data collection]
A single Likert item adapted from Heckler (2010), ranging from 1 to 6, with higher scores representing greater perceived importance. The exact text is provided in detailed preregistration: https://osf.io/xrckh/registrations.
- Perceived importance of animal welfare [2 weeks after baseline data collection]
A single Likert item adapted from Heckler (2010), ranging from 1 to 6, with higher scores representing greater perceived importance. The exact text is provided in detailed preregistration: https://osf.io/xrckh/registrations.
- Speciesism [2 weeks after baseline data collection]
Caviola et al.'s (2019) Speciesism Scale, consisting of 6 Likert items each ranging from 1 to 7. After reverse-coding, a higher score on the sum of the items (ranging from 6 to 42) represents greater speciesism. The exact text for all items is provided in detailed preregistration: https://osf.io/xrckh/registrations.
- Interest in animal welfare activism and reform [2 weeks after baseline data collection]
2 items modified from Corning et al.'s (2002) Activism Orientation Scale as well as 3 novel items, consisting in total of 5 items each ranging from 1 to 7. A higher score on the sum of the items (ranging from 5 to 35) represents greater interest in activism and reform. The exact text for all items is provided in detailed preregistration: https://osf.io/xrckh/registrations.
- Social dominance orientation [2 weeks after baseline data collection]
Ho et al.'s (2015) 8-item Social Dominance Orientation [SDO(7)] scale, consisting in total of 5 items each ranging from 1 to 7. After reverse-coding, a higher score on the sum of the items (ranging from 8 to 56) represents greater interest in activism and reform. The exact text for all items is provided in detailed preregistration: https://osf.io/xrckh/registrations.
Eligibility Criteria
Criteria
Inclusion Criteria:
-
Participant is currently located in the United States
-
Participant is at least 18 years old
Exclusion Criteria:
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Participant is located outside the United States
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Participant is less than 18 years old
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | Maya Mathur | Palo Alto | California | United States | 94304 |
Sponsors and Collaborators
- Stanford University
Investigators
- Principal Investigator: Maya B Mathur, PhD, Stanford University
Study Documents (Full-Text)
None provided.More Information
Additional Information:
Publications
None provided.- eatingveg