According to the Mayo Clinic: “Seasonal affective disorder (also called SAD) is a type of depression that occurs at the same time every year. If you’re like most people with seasonal affective disorder, your symptoms start in the fall and may continue into the winter months, sapping your energy and making you feel moody. Less often, seasonal affective disorder causes depression in the spring or early summer.”
Symptoms include but are not limited to sadness, irritability, lack of energy, trouble focusing, craving carbohydrates, weight gain, increased sleep, as well as a withdrawal from friends, family, and social activities.
The exact cause of Seasonal Affective Disorder is unknown, but theories include exposure to sunlight and hormone balance as well as Vitamin D deficiency. Interestingly enough, UVB light is need to initiate Vitamin D production in humans.
Some treatment options include antidepressants and light therapy. Increasing Vitamin D intake through supplementation may also be recommended, and symptoms will generally get better with the change of seasons.
Vitamin D Counil