09/24/2024
“Studies indicate that people with SAD, especially winter-pattern SAD, have reduced levels of the brain chemical serotonin, which helps regulate mood. Research also suggests that sunlight affects levels of molecules that help maintain normal serotonin levels. Shorter daylight hours may prevent these molecules from functioning properly, contributing to decreased serotonin levels in the winter.
Vitamin D deficiency may exacerbate these problems in people with winter-pattern SAD because vitamin D is believed to promote serotonin activity.”
https://www.nimh.nih.gov/health/publications/seasonal-affective-disorder #:~:text=Both%20serotonin%20and%20melatonin%20help,%2C%20mood%2C%20and%20behavior%20changes.
This fact sheet provides information about seasonal affective disorder (SAD), a type of depression. It includes a description of SAD, signs and symptoms, how SAD is diagnosed, causes, and treatment options.
