Do you find that your mood changes significantly as we go from autumn to winter?
Well, you're not alone. Seasonal affective disorder (SAD) is a type of depression that is four times more likely to strike women than men, according to a recent study in the American Journal of Psychiatry.
A whopping 4 to 6 percent of the U.S. population suffers from SAD, while up to 20 percent more may suffer from a milder form of the winter blues. And if you live in the northern latitudes, you are eight times more likely to be affected by SAD than if you live in sunnier regions.
During these bouts with depression in the winter, women tend to eat more and exercise less. They often have symptoms such as extreme fatigue and trouble falling asleep, or sleeping more often.
Several factors are thought to be connected to seasonal affective disorder, including a disturbance of your body´s internal clock, which tells you when it is time to be asleep and when it is time to be awake. Fewer daylight hours during the winter can also upset this clock, also known as circadian rhythms.
SAD is caused by the brain not receiving enough daylight which is needed to trigger serotonin, a hormone that regulates mood.
"Often the symptoms are severe enough to interfere with a person’s ability to function effectively at home or work, not just make them uncomfortable," says says Cort Christie of Alaska Northern Lights.
Approximately 85 percent of SAD cases benefit from exposure to bright light therapy, according to the American Psychiatric Association.
Patients are advised to sit near full-spectrum light boxes, which can simulate sunshine. This treatment seems to work especially well if done for 30 minutes at a time, preferably in the early morning, according to author and SAD specialist Dr. Norman Rosenthal. Daily exposure to light boxes that provide 2,500 to 10,000 lux (a measure of light intensity) is recommended. Researchers at Harvard reported that remission from SAD is twice as likely if this light therapy is also adjusted to your own melatonin rhythms.
Studies have also found that cells in the retina are particularly sensitive to blue light, suggesting that this wavelength may powerfully affect circadian rhythms. Researchers are investigating whether blue light might provide the same benefit as white light but with less exposure time.
General medications used to treat moderate depression are sometimes indicated, as are doses of melatonin, preferably monitored by a physician.
In his book, Winter Blues: Everything You Need to Know to Beat Seasonal Affective Disorder, Rosenthal outlines the signs to look for if you need to seek medical help:
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