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How is seasonal affective disorder linked to substance use disorder?

Seasonal Affective Disorder is linked to reduced sunlight and circadian disruption with light therapy and exercise recommended; risk is higher at northern latitudes, experts say.

  • Seasonal Affective Disorder is a common type of depression linked to winter's cold temperatures and short daylight hours, causing persistent fatigue and moodiness in affected people.
  • Studies point to decreased sunlight disrupting circadian rhythm, and researchers note a hard-wired slowdown when it becomes dark by 5 p.m., Brittney Schrick, extension associate professor and family life specialist for the University of Arkansas System Division of Agriculture, says.
  • The National Institute of Mental Health lists symptoms including persistent sadness, fatigue, difficulty concentrating, oversleeping and social withdrawal, and notes feeling sad, anxious or worthless beyond mild seasonality deserves attention.
  • People who live at more northern latitudes and individuals with prior depression or related psychiatric/physical conditions have higher risk; experts recommend contacting medical professionals if mood changes disrupt daily life or cause hopelessness.
  • Recommended steps include light therapy or more sunlight, with a light therapy box at least 10,000 lux, plus exercise and foods such as salmon, turkey, cheese, tofu, eggs, pineapple, nuts, oats and seeds.
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hugonews.com broke the news in Hugo, United States on Tuesday, January 13, 2026.
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