Associations of Bedtime Schedules in Childhood with Obesity Risk in Adolescence

We investigated whether bedtime schedules and bedtimes in childhood were associated with obesity risk adiposity adolescence. analysed the data of 12,645 singleton children classified as not obese at 7 years from Millennium Cohort Study United Kingdom. Bedtimes regularity 7-year-olds reported by parents. Bio-electric impedance body fat percentage (BFP) measurements 11 14 considered outcomes. The International Obesity Task Force age- sex-specific thresholds used to define obesity. was higher among never-regular compared those always-regular (risk ratio, RR, 2.8 (95% CI, 1.8–1.4) 2.3 1.5–3.6), respectively). An increasing irregularity an both a dose–response manner (ptrend < 0.001; ptrend = 0.002, BFP increased 1.1% 0.8–1.5) for boys 1.0% 0.6–1.4) girls every hour delay bedtime. Irregular later early- mid-adolescence manner. There marginal, but significant, increases during adolescence bedtimes.