According to data from the Centers for Disease Control and Prevention (CDC), across the United States, 8.1 percent of people over the age of 20 have depression over any given 2-week period.
For some people, depression might only be episodic and overcome within a matter of weeks or months.
However, for others diagnosed with major depression, the condition could persist for years, affecting their lifestyle and quality of life.
Looking at cases in which major depression lasts for over a decade, researchers from the Centre for Addiction and Mental Health (CAMH) in Ontario, Canada wanted to investigate whether living with this condition for so long would significantly impact the brain, and if so, how.
Dr. Jeff Meyer, from the CAMH, led a study focusing on that question.
He and his team compared the brain scans of people who had lived with untreated depression for 10 years or longer with those of people with a shorter history of depression.