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Why do people get depressed in winter? [Copy link] 中文

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Post time 2017-10-31 16:26:46 |Display all floors
This post was edited by senoritazhao at 2017-10-31 16:27


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Around 80% of Sad sufferers are women, particularly those in early adulthood. Photograph: Alamy/Guardian Design

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Post time 2017-10-31 16:33:30 |Display all floors
For many, the annual ritual of putting the clocks back for daylight saving time can be accompanied by a distinct feeling of winter blues as autumn well and truly beds in. This might be felt as a lack of energy, reduced enjoyment in activities and a need for more sleep than normal. But for around  2-8% of people in higher latitude countries such as Canada, Denmark and Sweden, these symptoms are so severe that these people are unable to work or function normally. They suffer from a particular form of major depression, triggered by changes in the seasons, called seasonal affective disorder or Sad.

In addition to depressive episodes, Sad is characterised by various symptoms including chronic oversleeping and extreme carbohydrate cravings that lead to weight gain. As this is the opposite to major depressive disorder where patients suffer from disrupted sleep and loss of appetite, Sad has sometimes been mistakenly thought of as a “lighter” version of depression, but in reality it is simply a different version of the same illness. “People who truly have Sad are just as ill as people with major depressive disorder,” says Brenda McMahon, a psychiatry researcher at the University of Copenhagen. “They will have non-seasonal depressive episodes, but the seasonal trigger is the most common. However it’s important to remember that this condition is a spectrum and there are a lot more people who have what we call sub-syndromal Sad.”

Around 10-15% of the population has sub-syndromal Sad. These individuals struggle through autumn and winter and suffer from many of the same symptoms but they do not have clinical depression. And in the northern hemisphere, as many as one in three of us may suffer from “winter blues” where we feel flat or disinterested in things and regularly fatigued.

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Post time 2017-10-31 16:34:41 |Display all floors
For those on the Sad spectrum, there are a variety of treatments available, the most popular being bright-light therapy, an artificial means of stimulating the brain’s neurotransmitters. “It’s very important to use a Sad-specific ultraviolet filtered light otherwise it can be dangerous,” says Levitan. “But it can really enable people with Sad to get their day started earlier and avoid oversleeping, which can be very depressogenic. It’s probably effective in providing symptom relief in around 80% of patients, particularly those with the carbohydrate craving, oversleeping symptoms. For the most severe patients, though, it may have to be combined with antidepressant therapy.”


Sad therapy lamps tested: ‘The optical equivalent of a freezing cold shower'

However, psychiatrists urge patients to steer clear of some of the many alternative therapies on the market. “There’s a range of new technologies people are developing, such as an earplug that is supposed to radiate light into your brain, but there’s no science to prove that this actually works,” McMahon says. “However, there are some good additions to conventional light therapy and antidepressants, such as tryptophan, an amino acid that gets converted to serotonin in our bodies, which can be given as an add-on treatment.”

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Post time 2017-11-1 08:39:43 |Display all floors
Day time become short ?

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Post time 2017-11-1 15:32:32 |Display all floors
Dracarys Post time: 2017-11-1 08:39
Day time become short ?

yes one of the most important reasons.

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Post time 2017-11-2 15:01:47 |Display all floors

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Post time 2017-11-2 15:49:06 |Display all floors
I don't think so. Cold weather could help the head keep cool and have a clear thinking about the reality!
The most useful knowledge and skill that we are lack of is that of about human!

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