Ответ:
1. The advice given by doctors is to take a break every hour.
2.To avoid neck strain you should set your monitor at the right height.
3. keyboards are full of harmful bacteria that can cause illness.
4. Do not eat food at your computer without washing your hands first.
5. извини, тут не знаю. У меня есть вариант You should get up and walk around not to spend too long sitting at a computer. Но я в нем совсем не уверена(