Sleep medicine: XJul 3, 2025

Nighttime Artificial Light Exposure as a Possible Risk Factor for Type 2 Diabetes

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗

Updated Mar 30, 2026

Abstract

For every 10-lux increase in nighttime light exposure, the risk of developing type 2 diabetes rises by 30%.

Nighttime light exposure may disrupt circadian rhythms, affecting sleep and glucose metabolism.
Artificial light at night is associated with an increased risk of metabolic dysfunction.
Data from the UK Biobank was used to assess personal light exposure patterns and their link to type 2 diabetes risk.
Mitigating nighttime light exposure, particularly in urban areas, could help reduce the risk of type 2 diabetes.
Raising awareness about light pollution may contribute to diabetes prevention efforts.

Simplified

This study examines the effect of nighttime light exposure on the risk of developing type 2 diabetes Mellitus (T2DM), highlighting an often-overlooked environmental factor. While lifestyle choices such as diet and physical activity have long been recognized as critical risk factors for T2DM, emerging evidence suggests that artificial light at night (LAN) may also play a significant role. LAN disrupts circadian rhythms, which regulate sleep cycles and glucose metabolism, leading to metabolic dysfunction. Using data from the UK Biobank, researchers assessed the relationship between personal light exposure patterns and T2DM risk. Findings revealed that for every 10-lux increase in LAN, the risk of developing T2DM rises by 30 %. The study underscores the importance of circadian alignment in metabolic health and suggests that mitigating nighttime light exposure, especially in urban environments, could be a practical strategy for reducing T2DM risk. Raising awareness about the health risks of light pollution and advocating for healthier lighting solutions in public spaces could play a crucial role in T2DM prevention. Further research is needed to confirm these findings and explore interventions that reduce nighttime light exposure and its impact on diabetes risk.

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Competing interests

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

PubMed

Nighttime Artificial Light Exposure as a Possible Risk Factor for Type 2 Diabetes

Abstract

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Funding

Competing interests

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Abstract

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