Sodium

Sodium is an essential mineral and contributes to the right
fluid balance in the body and maintains good muscle activity.
The Directorate has pointed out that Icelanders on average
use about 10 g of sodium a day and they indicate how far
in excess of the desired amount it is, and that it should be less than 5 g.
Sodium overuse can cause a variety of
health problems such as high blood pressure, increased likelihood
of osteoporosis and kidney stones. Overuse also increases
the likelihood of more serious heart problems such as enlargement
of the heart muscle and heart attack.
Sodium binds water and if too much sodium is consumed
it appears as edema and swelling for example in the face.