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First-year college students' weight change is influenced by their randomly assigned roommates' BMI.

ABSTRACT: BACKGROUND:There is ongoing debate about whether friends' greater similarity in Body Mass Index (BMI) than non-friends is due to friend selection, shared environments, or peer influence. METHODS:First-year college students (n = 104) from a southwestern U.S. university were randomly assigned roommates during the university's housing process, effectively removing friend selection effects. Participant BMI was measured up to four times (T1-T4) across 2015-2016. The influence of roommate baseline BMI (T1) on change in participant BMI over time (T2-T4) was analyzed using a linear mixed effects model adjusted for individual socio-demographics, linear time trends, baseline BMI, and physical clustering of students. A sensitivity analysis examining floormates was also conducted. RESULTS:Consistent with roommate influence, participants randomized to roommates with a higher BMI gained more weight between times T2 and T4 (? = 0.06; 95% CI = 0.02, 0.10). No shared environment effects (shared campus or floor) were found. CONCLUSIONS:Randomly assigned roommates influenced each other's weight trajectories. This clarifies that BMI convergence can occur outside of friend selection or shared environments mechanisms.

SUBMITTER: van Woerden I

PROVIDER: S-EPMC7685435 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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First-year college students' weight change is influenced by their randomly assigned roommates' BMI.

van Woerden Irene I Hruschka Daniel D Brewis Alexandra A Schaefer David R DR Bruening Meg M

PloS one 20201124 11

<h4>Background</h4>There is ongoing debate about whether friends' greater similarity in Body Mass Index (BMI) than non-friends is due to friend selection, shared environments, or peer influence.<h4>Methods</h4>First-year college students (n = 104) from a southwestern U.S. university were randomly assigned roommates during the university's housing process, effectively removing friend selection effects. Participant BMI was measured up to four times (T1-T4) across 2015-2016. The influence of roomma ...[more]

PMID: 33232356

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Project description:The young adult years have been recognized as an influential period for excess weight gain. Non-traditional students and those attending 2-year community colleges are at particularly high risk for a range of adverse weight-related outcomes.Choosing Healthy Options in College Environments and Settings was an RCT with students randomly assigned into a control or intervention condition after baseline assessment. The study was designed to evaluate if a 24-month weight-gain prevention intervention reduces the expected increase in BMI and overweight prevalence in young adults attending 2-year colleges. Two cohorts were recruited, corresponding to the fall and spring semesters. Data collection occurred at four time points for each cohort, with baseline occurring in fall 2011 for Cohort 1 and spring 2012 for Cohort 2. The 24-month follow-up occurred in fall 2013 for Cohort 1 and spring 2014 for Cohort 2. Data analysis occurred in 2015-2016.This research was conducted with 441 students from three community colleges in Minnesota.The 24-month intervention began with a 1-credit college course on healthy weight behaviors. A social networking and social support website was introduced as part of the course and participation encouraged for the duration of the trial.Changes in BMI, weight, body fat percentage, waist circumference, and weight status were assessed.Retention of the cohorts at 24 months was 83.4%. There was not a statistically significant difference in BMI between conditions at the end of the trial. However, there was a statically significant difference in the prevalence of overweight/obesity between treatment conditions at 24 months. Also, participants randomized to the intervention who were overweight or obese at baseline were more than three times as likely to transition to a healthy weight by the end of the trial as compared with control students.The intervention was not successful in achieving BMI differences between treatment groups. However, an 8% reduction in the prevalence of overweight and obesity over time may have population-level significance.This study is registered at www.clinicaltrials.gov NCT01134783.

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First-year college students' weight change is influenced by their randomly assigned roommates' BMI.

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First-year college students' weight change is influenced by their randomly assigned roommates' BMI.

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