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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.
See detailed preregistration: https://osf.io/xrckh/registrations
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Intervention | Experimental | See detailed preregistration: https://osf.io/xrckh/registrations |
|
| Control | Sham Comparator | See detailed preregistration: https://osf.io/xrckh/registrations |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Documentary | Behavioral | A 20-minute documentary about the health, environmental, and animal welfare consequences of eating meat and animal products |
|
| Measure | Description | Time Frame |
|---|---|---|
| Total meat and animal product consumption | Self-reported meat and animal product consumption (ounces consumed over the past week) | Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection |
| Measure | Description | Time Frame |
|---|---|---|
| Total meat consumption | Self-reported meat consumption (ounces consumed over the past week) | Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection |
| Total animal product consumption |
| Measure | Description | Time Frame |
|---|---|---|
| Perceived importance of health | 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. | 2 weeks after baseline data collection |
| Perceived importance of environmental sustainability |
Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Maya B Mathur, PhD | Stanford University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Maya Mathur | Palo Alto | California | 94304 | United States |
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| Label | URL |
|---|---|
| Future location of data, code, and materials | View source |
| Detailed preregistration | View source |
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All materials and analysis code required to reproduce all results will be made publicly available. All data except for participants' counties of residence (which is considered identifying information) will also be made publicly available.
Immediately upon journal acceptance or earlier if possible given embargo policies.
Public availability
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| ID | Term |
|---|---|
| D005247 | Feeding Behavior |
| ID | Term |
|---|---|
| D001522 | Behavior, Animal |
| D001519 | Behavior |
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| Control | Behavioral | A 20-minute unrelated video (a motivational talk entitled "Listening to shame") |
|
Self-reported animal product consumption (ounces consumed over the past week)
| Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection |
| Consumption of each of 8 individual categories of meats and animal products | Self-reported consumption (ounces consumed over the past week) | Consumption over the 1-week time frame spanning approximately 1 week to 2 weeks after baseline data collection |
| Total consumption of selected, healthy plant-based foods (ounces consumed over the past week) | Self-reported consumption (ounces consumed over the past week) | Consumption over the 1-week time frame spanning approximately 1 week to 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. |
| 2 weeks after baseline data collection |
| Perceived importance of animal welfare | 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. | 2 weeks after baseline data collection |
| Speciesism | 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. | 2 weeks after baseline data collection |
| Interest in animal welfare activism and reform | 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. | 2 weeks after baseline data collection |
| Social dominance orientation | 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. | 2 weeks after baseline data collection |