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Depression (Seasonal affective disorder (SAD) (Neuro Mechanism (Seratonin,…

- - - - UK
      - Canada
      - Denmark
      - Sweden
  - - - Symptoms
        
        Blue
        
        Fatigued
        
        Uninterested in things
  - - - Energy conservation in the Ice-Age
  - - - Phase Delayed
    - - Regulates
        
        Anxiety
        
        Happiness
        
        Mood
      - Influenced by
        
        Light
  - - - tryptophan