The relationship between season and psychological health in terms of mood has been greatly researched. A recent study shows the cortisol function differs over season in people reporting “Seasonal Affective Disorder” or SAD [1]. This may finally help us to understand any biological mechanism underlying of SAD.
![Seasonal affective disorder Seasonal affective disorder](https://www.highlighthealth.com/wp-content/uploads/2011/02/seasonal-affective-disorder.jpg)