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Completed

NCT Number: NCT05131529

Reshaping Food Choice at University of Michigan

Nearly a quarter of global greenhouse gas emissions originate from agriculture. Consumer demand for food, especially carbon-intensive red meats, largely underlies these emissions. Therefore, reducing consumption of red meat has the potential for transformative impacts on climate change. Our interdisciplinary team of researchers and dining staff aims to determine the carbon impact of evidence-based behavior change interventions to reduce red meat consumption at University of Michigan dining halls. Using an experimental design, we will evaluate the impacts of three "nudge" interventions (i.e., modifying environmental cues and incentives) to reduce red meat consumption in three randomly assigned treatment dining halls vis-à-vis three paired control dining halls. Nudges will include changing default food items and altering food labels. We will: 1) collect data on meals served during each intervention periods to assess the separate and combined effects of the interventions on red meat consumption; 2) conduct e-mail interviews with students to understand treatment effect heterogeneity and sociodemographic determinants of food choice; and, 3) conduct focus group discussions and interviews, respectively, with students and dining staff to assess implementation feasibility. We expect that this research will generate scalable, replicable solutions for reducing greenhouse gas emissions through dietary change at universities and similar institutions, will significantly advance the food choice literature, and will influence sustainability strategies at university dining operations nationally given the proposed team's close partnership with regional and national dining programs.

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Key information

Conditions

Climate Change Behavior Feeding Behavior Food Preferences

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Michigan

Ann Arbor, Michigan, 48109, United States

Who can participate

Healthy volunteers accepted: Yes

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

Student Survey:

  • An individual must have been a frequent diner at one of the six project dining halls during the first three weeks of the academic term
  • An individual must have attended only treatment or only control dining halls for 90% or more of their dining hall visits during the first three weeks of the academic term

Student Focus Group:

  • Must have participated in the student survey
  • We will stratify the sample by selecting respondents whose red meat consumption either increased, decreased or remained the same (based on baseline to endline comparisons of data in the student survey)

Dining Staff Interviews:

  • Must have been a non-student member of the Michigan Dining staff at one of the six project dining halls during the relevant intervention period.

Treatment and study plan

Taste-focused labels

Other

We will implement taste-focused labels on plant-based dishes in each of the 3 treatment dining halls to re-brand dishes with attributes focused on the taste of the dish (e.g., renaming a "Squash with Ginger" side to "Aromatic Thai Curry Kabocha Squash With Zesty Ginger").

Carbon impact labels

Other

We will add labels next to all dishes served in treatment dining halls that indicate whether production of the ingredients in the dish contribute a high, moderate or low amount of carbon emissions. These labels will be absent from the same dishes served in control dining halls. Labels will be added to point-of-service signs, digital menu boards, and menu information on a mobile app.

Changing default menu options

Other

We will make red meat items an opt-in (as opposed to opt-out) item across all meal stations in treatment dining halls. All menu stations will exclude red meat by default, and dining hall patrons will have to request the addition of red meat to meals. At control dining halls, red meat items will be provided by default at meal stations as normal.

Primary outcomes

  1. The difference in the change in the average amount of red meat served in treatment vs. control dining halls from the pre-intervention to intervention period based on service data from dining hall operations staff

    Time frame: 11 week intervention period (during each of 3 academic semesters)

    We will assess the amount of red meat served across project dining halls from the the pre-intervention to the intervention period using "post-cost" data collected by operations staff (i.e., the amount of each dish prepared prior to the start of a meal period as well as the amount of each dish remaining at the end of the meal period with units of measure standardized to kg. We will assess the average weight of red meat served in each dining hall during the pre-intervention baseline period compared to the average weight of red meat served in each dining hall during the intervention period. We will do a difference-in-difference analysis to identify whether the change in the amount of red meat served at treatment vs. control dining halls differed during this time period. Difference-in-difference analyses examine the difference in the change in an outcome between a treatment and control group.

  2. The difference in the change in the average amount of red meat purchased by dining halls in treatment vs. control dining halls from the pre-intervention to intervention period

    Time frame: 11 week intervention period (during each of 3 academic semesters)

    We will assess the average amount of red meat purchased by each of the 6 project dining halls during the pre-intervention period and during the intervention period.

    We will do a difference-in-difference analysis to identify whether the change in the amount of red meat purchased at treatment vs. control dining halls differed during these time periods.

  3. The difference in the change in the average amount of red meat consumed in treatment vs. control dining halls from the pre-intervention to intervention period based on 30-day food frequency questionnaire intake

    Time frame: 11 week intervention period (during each of 3 academic semesters)

    We will assess the amount of red meat consumed by a subsample of dining hall patrons (n = 1,000) at each of the 6 project dining halls from the start to the end of each intervention period. This will be done through a self-administered food frequency questionnaire that asks respondents to report their frequency of consumption of red meat items in the previous 30 days.

    We will do a difference-in-difference analysis to identify whether the change in the amount of red meat consumed by respondents who frequently patron treatment vs. control dining halls differed during this time period.

Secondary outcomes

  1. The change in the average amount of red meat served at meal stations in treatment vs. control dining halls from the pre-intervention to intervention period based on service data from dining hall operations staff

    Time frame: 15 weeks (4 week baseline period + 11 week intervention period (during each of 3 academic semesters)

    We will assess the average amount of red meat served in each of the 6 project dining halls during the pre-intervention and the intervention periods. We will assess the difference in this amount of red meat served within a single dining hall to assess if and how this amount changed. Data on red meat served in each dining hall will begin 4 weeks before the start of each intervention period, thereby allowing us to compare the amount of red meat served before interventions begin to red meat served thereafter.

    We will assess the average weight of red meat served in each dining hall during the pre-intervention baseline period compared to the average weight of red meat served in each dining hall during the intervention period.

  2. The change in the average amount of red meat purchased by dining halls in treatment vs. control dining halls from the pre-intervention to intervention period

    Time frame: 15 weeks (4 week baseline period + 11 week intervention period (during each of 3 academic semesters)

    We will assess the amount of red meat purchased in each of the 6 project dining halls during the pre-intervention and the intervention periods. We will assess the difference in this amount of red meat purchased within a single dining hall to assess if and how this amount changed. Data on red meat purchased in each dining hall will begin 4 weeks before the start of each intervention period, thereby allowing us to compare the amount of red meat purchased before interventions begin to red meat purchased thereafter.

Sponsors and collaborators

Lead sponsor

University of Michigan

Other

Collaborators

  • Graham Sustainability Institute of the University of Michigan

Registry information

Official study title

Reshaping Food Choice at University of Michigan Dining Halls to Accelerate Carbon Neutrality

Important dates

Study start
2021
Primary completion
2022
Study completion
2022
First posted
Nov 23, 2021
Registry last updated
Jan 12, 2023

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

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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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