Association between exposure to outdoor artificial light at night during pregnancy and glucose homeostasis: A prospective cohort study

An increase in outdoor artificial light at night (ALAN) was associated with a 0.02 mmol/L higher fasting plasma glucose during the first trimester.

• Outdoor ALAN exposure was linked to elevated markers of glucose homeostasis in pregnant women.
• Specifically, an increase in ALAN was associated with a 0.42 μU/mL increase in insulin levels.
• There was a 0.09 increase in insulin resistance as measured by HOMA-IR with higher ALAN exposure.
• The associations between ALAN and glucose markers were stronger in women who conceived in summer and autumn.
• No significant link was found between ALAN exposure and the risk of gestational diabetes mellitus.

AI simplified