Time spent using the Internet cannot be spent in face-to-face social contact, so psychologists have speculated that sharply increasing Internet use can cause depression.

使用互联网的时间不能用于面对面的社会接触，因此心理学家推测，大量使用互联网会导致抑郁。

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It is also believed that low levels of it can cause depression.

而且，低水平的维生素d，可能导致抑郁症。

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If the answer is yes, can it affect behavior and cause depression?

如果答案是肯定的，它会影响行为并导致抑郁症吗？

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"After many years of trying to figure out what is going on with the genetic cause of depression, we're still not there yet."

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The problem: Researchers don't have the slightest idea which brain circuits cause depression.

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Some cytokines have also been found to cause depression, which can also, of course, cause loss of appetite, worsening the condition.

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The October 1929 stock exchange collapse did not cause the Depression any more than Black Monday did in 1987.

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