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Shorter sleep among adolescents is associated with lower fruit and vegetable consumption the following day.

Accepted version
Peer-reviewed

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Authors

Winpenny, Eleanor M  ORCID logo  https://orcid.org/0000-0003-1933-0168
Rowthorn, Harriet 
Hollidge, Stefanie 
Westgate, Kate 
Goodyer, Ian M 

Abstract

BACKGROUND: Insufficient sleep has been associated with weight gain and metabolic dysregulation, with one suggested mechanism being through reduction in diet quality. Experimental evidence supports a causal effect of sleep timings on diet but this may not be applicable to a free-living adolescent population. In this analysis we use daily measures of sleep timings and diet quality, to examine the effect of sleep duration and timing on diet quality the following day among free-living adolescents. METHODS: The ROOTS study is a prospective cohort recruited from secondary schools in Cambridgeshire and Suffolk (UK). Participants (n = 815) at mean age 15.0y (SD 0.3y) completed a diet diary and wore a combined heart rate and accelerometer device over 4 consecutive days. Sleep duration and timing (midpoint) were derived from acceleration and heart rate traces, while daily energy density and fruit and vegetable intake were calculated from dietary data. Analyses were performed at day-level (1815 person-days). Multilevel random effects models were used to test associations between sleep each night and subsequent day diet, with daily sleep and diet measures nested within individuals and schools, and adjusted for day-level and individual-level confounding variables. RESULTS: Adolescents slept a mean of 7.88 hrs (SD 1.10) per night, reporting a mean energy density of 2.12 kcal/g (SD 0.48) and median energy-adjusted daily fruit and vegetable intake of 137.3 g (IQR 130.4). One hour shorter sleep duration was associated with lower intake of fruit and vegetables (-6.42 g, 95%CI -1.84, -10.99) the following day. An association with higher dietary energy density (0.016 kcal/g, 95%CI 0.034, -0.002) the following day was observed but did not reach statistical significance. Sleep timing was not associated with either fruit and vegetable intake (-2.52 g/d, 95%CI -7.66, 2.62) or dietary energy density (-0.001 kcal/g, 95%CI -0.022, 0.020). CONCLUSIONS: Our observational findings from a free-living adolescent population support the experimental evidence for a causal role of sleep on diet, with shorter sleep duration at night leading to a small decrease in diet quality the following day. These findings support experimental evidence to suggest inclusion of sleep duration as one component of interventions designed to improve diet quality and weight status in adolescents.

Description

Keywords

Adolescent, Diet quality, Energy density, Fruit and vegetable intake, Longitudinal, Sleep duration, Sleep timing, Adolescent, Humans, Vegetables, Fruit, Prospective Studies, Feeding Behavior, Diet, Sleep

Journal Title

Int J Behav Nutr Phys Act

Conference Name

Journal ISSN

1479-5868
1479-5868

Volume Title

Publisher

BioMed Central
Sponsorship
MRC (MC_UU_00006/5)
Medical Research Council (MC_UU_12015/7)
MRC (MR/T010576/1)
Cambridge University Hospitals NHS Foundation Trust (CUH) (146281)
Wellcome Trust (074296/Z/04/Z)
Medical Research Council (MC_UU_12015/3)
MRC (MC_UU_00006/4)
National Institute for Health Research (IS-BRC-1215-20014)
The ROOTS study was funded by the Wellcome Trust (grant number 074296) and the NIHR Collaboration for Leadership in Applied Health Research and Care East of England. This work was supported by the UK Medical Research Council (grant number MC_UU_12015/3, MC_UU_12015/7, MC_UU_00006/4, MC_UU_00006/5). EMW is funded by a Career Development Award from the UK Medical Research Council (MR/T010576/1). SB, SH and KW were additionally supported by NIHR Cambridge Biomedical Research Centre (IS-BRC-1215-20014). HR was funded by the University of Cambridge ‘Returning Carers Scheme’.