Doctors say that the immune system is very complex and still not fully understood.
Experts said that people should eat less sugar, sleep at least 6 hours and to not be alone.
Health can undermine not only the infections and viruses, but also other unexpected factors.
This lack of sleep, excessive consumption of sugar and loneliness.
If a man sleeps little, and his immune cells do not have time to recover. Sugar reduces the immune activity of white blood cells, and if the person is alone, he has raised the level of stress hormones, and this, in turn, reduces the viral defense of the body.
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