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Indoor light at night linked to obesity in children and teens with different activity levels
Updated
Abstract
Essence
was linked to higher obesity-related measures in children and adolescents, mainly among those with less than 1 hour/day of moderate-to-vigorous physical activity.
Evidence
A cross-sectional Shanghai study measured one week of indoor nighttime light in 628 participants aged 9-15 and found longer exposure to light >=1 lx associated with higher , , trunk fat, waist circumference, and obesity odds.
Caveat
The design was observational and cross-sectional, so it cannot show that nighttime light caused obesity or confirm physical activity as the modifier.
Simplified
Key numbers
0.34
Increase in per SD increase in
Each SD (12.3 lx) increase in indoor exposure
0.72 cm
Increase in waist circumference per SD increase in duration
Extended exposure to ≥ 1 lx by 67.0 min/day
1.27
Odds ratio for obesity per SD increase in duration
Each SD increase in duration is significantly associated with obesity