#9 It can be seasonal
Image Source: stashabella
Many people living in colder climates do not look forward to the onset of winter. While it may be a bit of an inconvenience or annoyance for many, those suffering from Seasonal Affective Disorder or SAD, may be facing months of painful depression as the winter months approach. Experts believe that lack of light due to shorter days may have a lot to do with SAD, and could be tied in with reduced vitamin D levels in the body, since exposure to sunlight is an important way for the body to manufacture this essential vitamin.
