Nocturnal light exposure aggravates schizophrenia via gut microbiota mediated lipid metabolism: Human and animal multi-omics evidence

Oct 14, 2025Ecotoxicology and environmental safety

Nighttime light worsens schizophrenia by changing gut bacteria and fat metabolism: evidence from humans and animals

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Abstract

Reduced artificial light at night (ALAN) exposure was associated with lower depression and psychosis scores in schizophrenia patients.

  • Lower Early Signs Scale (ESS) scores for depression and incipient psychosis were observed with reduced ALAN.
  • Higher Montreal Cognitive Assessment (MoCA) scores were associated with reduced ALAN exposure.
  • Stabilized gut microbiota and improved linoleic acid metabolism were linked to the benefits of reduced ALAN.
  • In a mouse model, ALAN exposure led to gut dysbiosis, disrupted linoleic acid metabolism, and behaviors resembling schizophrenia.
  • Linoleic acid supplementation partially improved behavioral outcomes in mice exposed to ALAN.

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