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Completed

NCT Number: NCT04507087

Documentary to Encourage Plant-based Eating

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.

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Key information

Conditions

Eating Behavior Behavior Behavior, Animal Feeding Behavior

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Maya Mathur

Palo Alto, California, 94304, United States

About this study

See detailed preregistration: https://osf.io/xrckh/registrations

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Participant is currently located in the United States
  • Participant is at least 18 years old

Exclusion criteria

  • Participant is located outside the United States
  • Participant is less than 18 years old

Treatment and study plan

Documentary

Behavioral

A 20-minute documentary about the health, environmental, and animal welfare consequences of eating meat and animal products

Control

Behavioral

A 20-minute unrelated video (a motivational talk entitled "Listening to shame")

Primary outcomes

  1. Total meat and animal product consumption

    Time frame: 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 outcomes

  1. Total meat consumption

    Time frame: 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)

  2. Total animal product consumption

    Time frame: 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)

  3. Consumption of each of 8 individual categories of meats and animal products

    Time frame: 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)

  4. Total consumption of selected, healthy plant-based foods (ounces consumed over the past week)

    Time frame: 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 outcomes

  1. Perceived importance of health

    Time frame: 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. Perceived importance of environmental sustainability

    Time frame: 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.

  3. Perceived importance of animal welfare

    Time frame: 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.

  4. Speciesism

    Time frame: 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.

  5. Interest in animal welfare activism and reform

    Time frame: 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.

  6. Social dominance orientation

    Time frame: 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.

Sponsors and collaborators

Lead sponsor

Stanford University

Other

Registry information

Official study title

Randomized Controlled Trial of a Documentary to Encourage Plant-based Eating

Important dates

Study start
2020
Primary completion
2020
Study completion
2020
First posted
Aug 11, 2020
Registry last updated
Mar 17, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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