There is also evidence that RLS has a genetic component. RLS occurs three to five times more frequently in an immediate family member of someone who has RLS than in the general population.
noI HAVE to improve upon this answer! NO, RLS in itself is not deadly, but severe sleep deprivation that comes along with it can be very deadly. RLS is connected to heart disease, diabetes, drowsy...
Diet is one factor that can prevent symptoms of RLS. A helpful diet will include an adequate intake of iron and the B vitamins, especially B12 and folic acid.