Here is one of a computer user's opinion :
I work 10+ hours a day on a computer and my health has gone downhill. Everything you mentioned is accurate. It affects eyesight and sitting all day can lead to weight problems. I think mental health issues come into play with being isolated. At my work, everyone sits around and talks while I am busy on the computer.
Since I started working on the computer for a living, I have developed a vitamin D deficiency. That is from being indoors during daylight hours and could apply to things other than the computer. There are repetitve strains and if you sit incorrectly in front of a computer, you can damage your back as well. I know that magnetism/electronic fields used to be a problem back in the days of CRT monitors, but am not sure how prevalent it is now. Who knows what all the wireless transmissions could be doing to us? All in all, I don't think we know half of the ways that technology and computer specifically could be damaging us yet.
Source : http://answers.yahoo.com/question/index?qid=20090117143603AAMuqIT
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