0235 Social Jetlag and Diet Quality Among US Young Adults

Abstract

Abstract Introduction Young adults are among the populations with the lowest quality diets in the US, and poor sleep could be a contributing factor. Social jetlag, the lack of consistent sleep timing from weekdays to weekends, is also more common among young adults. Our objective was to examine associations between social jetlag and diet quality among US young adults, and to evaluate effect modification by sex or race/ethnicity. Methods The study population included 1,308 adults aged 20-39 who participated in the 2017-2018 National Health and Nutrition Examination Survey. Social jetlag was considered as ≥2-hour difference in sleep midpoint (median of bedtime and wake time) between weekends and weekdays. Diet quality was assessed with the Healthy Eating Index (HEI)-2015, which is comprised of 13 dietary components and ranges from 0 to 100 (higher scores=better diet quality). Scores were binned into three groups based on tertile cutoffs. Ordinal logistic regression analyses were utilized to evaluate the relationship between social jetlag and HEI-2015 scores as well as the individual HEI components, adjusting for age, sex, race/ethnicity, educational attainment, recent tobacco use and physical activity. Effect modification by sex and race/ethnicity were also considered. Results In the analytic sample, 31% of young adults had social jetlag. Overall, there were no associations between social jetlag and diet quality. However, interaction analysis revealed several associations were race-specific (P, interaction< 0.05). Among Black adults, social jetlag was associated with lower overall diet quality (OR = 0.4, 95% CI 0.2, 0.8; i.e., less likely to be in higher diet quality tertiles) and more unfavorable scores on total vegetables (OR = 0.6, 95% CI 0.3, 1.0) and added sugar (i.e., OR = 0.6, 95% CI 0.4, 0.9). For Hispanic adults, social jetlag was associated with higher intakes of sodium (OR=0.6, 95% CI 0.4, 0.9) However, White adults with social jetlag had higher intake of greens and beans (OR = 1.9, 95% CI 1.1, 3.2). Conclusion Within a nationally-representative sample of US young adults, social jetlag was related to certain indicators of lower diet quality among Black and Hispanic Americans. Support (if any) Dr. Jansen was supported by K01HL151673.