Evidence for a Possible Link between Bedtime and Change in Body Mass Index.

Area of Science:

• Public Health
• Epidemiology
• Human Development

Background:

• Childhood and adolescent obesity are significant public health concerns.
• Understanding longitudinal factors influencing body mass index (BMI) is crucial for effective interventions.
• The transition from adolescence to adulthood involves critical developmental changes that can impact health behaviors and outcomes.

Purpose of the Study:

• To investigate the long-term association between bedtime and body mass index (BMI).
• To examine this relationship across the developmental stages from adolescence to adulthood.
• To identify potential mediators in the bedtime-BMI relationship.

Main Methods:

• Utilized data from the National Longitudinal Study of Adolescent Health (3,342 participants).
• Assessed bedtimes and BMI across three waves (1994-2009).
• Employed hierarchical linear models with a two-level random intercept and slopes model.

Main Results:

• A later average workweek bedtime from adolescence to adulthood correlated with increased BMI over time.
• This association remained significant after controlling for demographics and baseline BMI.
• Fast-food consumption partially mediated the longitudinal relationship between bedtime and BMI.

Conclusions:

• Bedtimes represent a modifiable factor for weight management strategies.
• Interventions targeting bedtime may be beneficial during adolescence and the transition to adulthood.
• Further research into mediators like dietary habits can refine weight management approaches.