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Feeling down? You're not alone.
你有感到很失落嗎?不只你這樣。
If depression seems pretty common, it is.
抑郁看起來很普遍，事實上也是如此。
One in every ten adults suffers from depression.
每十個成年人里就有一個會患有抑郁癥。
And that's what has scientists puzzled.
這讓科學家們感到不解。
If depression is a detrimental condition, why is it so rampant in the population?
如果抑郁對身體有害，那么為什么人群中抑郁癥患者如此之多呢?
Some scientists think they may have the answer.
一些科學家認為他們已經找到了答案。
Depression may have an evolutionary benefit.
抑郁也許對進化有好處。
It may improve one's chances of fighting off infection.
它能提高人體免疫力。
Scientists have known that depressed people display an immunoactive condition known as inflammation,
一些科學家發現抑郁癥人群體內會產生免疫活性，也就是炎癥，
even when they are not infected.
即便他們未受到感染時也會如此。
For several years they have been finding that genes linked to depression also affect the function of the immune system.
幾年來，科學家們逐漸發現與抑郁有關的基因也會影響免疫系統的功能。
Stress, which can lead to depression, also modifies the immune system.
同樣會導致抑郁的壓力因素也會改變免疫系統。
These findings suggested that depression was somehow linked to the body's ability to fight disease.
從某種程度上講，這些調查結果表明抑郁與人體免疫力有關。
Some scientists now propose that depression might have had an evolutionary advantage in the days before modern medicine and antibiotics.
一些科學家提出早在現代藥物和抗生素出現之前，抑郁就可能能夠給進化帶來好處。
譯文為可可英語翻譯，未經授權請勿轉載!
