In the depths of winter, some people find themselves feeling depressed, anxious, and lethargic. For many of these people, the cause is Seasonal Affective Disorder (SAD).
It is believed SAD affects about one in ten people in the higher latitudes (above 60 degrees from the equator) and about one in twenty in the middle latitudes (most of the US, for instance). The only part of the world where SAD is not found is in the tropics, where daily sunshine is roughly the same at all times of year.
What causes SAD? We don’t really know. It is believed by many researchers to be either a rise in melatonin or a drop in serotonin due to the shorter days and the sun being lower in the sky. Melatonin is a sleep-related hormone, and when you experience less light, your body produces more of it; you therefore want to sleep more and feel less energetic. Serotonin is a neurotransmitter that is tied to positive moods, and with less light, your body produces less of it; this leads to having a more negative outlook throughout your day. It also may be the result of a disruption to the circadian rhythm of the body, again due to the lack of light through the day.
The symptoms of SAD readily identifiable: depression, sleep problems, lethargy, irritability, anxiety, mood changes, and a loss of libido. A person with SAD will also probably get sick more often, as it is believed to weaken the immune system. He will crave sugary foods in much higher quantities, probably leading to weight gain.
The disorder is, as named, seasonal. Most symptoms will start to develop in the fall, and will be strongest in January and February. By mid-spring they should have disappeared for most people.
Treatment for SAD basically involves getting large quantities of light for several hours a day. People who spend a lot of time outside probably already get this, but office workers and those who stay indoors all day will not. Therefore, the first treatment is to get a particular kind of lamp that simulates sunlight. By working in the light of the lamp, your body finds the right balance and behaves as expected. For some, however, antidepressant drugs and psychotherapy are deemed necessary.
Seasonal Affective Disorder is no fun, but it is easy to avoid in most cases. If you live in an area that gets little light in the winter, spend time every day getting as much daylight and bright indoor light as possible. You, and everyone around you, will feel better.
Resources:
- Seasonal affective disorder (SAD) [www.mayoclinic.com]
- The Seasonal Affective Disorder Association [www.sada.org.uk]
- Seasonal Affective Disorder [www1.nmha.org]
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From the editor
My wife and I are getting ready to leave for three weeks in Thailand at the end of this week. We’re planning on spending a week just relaxing on the beach, then we’ll be trekking in the highlands of northern Thailand. We’re both especially looking forward to being warm for a while… no snow for three weeks!
I will not be responding to email while I am away, but I will get back to you once I return.
Hope you have a great February!
Healthy thoughts,
Jeff


