http://www.businessinsider.com/iodization-effect-on-iq-2013-7 An interesting article about iodization effects on IQ. After back in 1924 we started using iodine salt to arrest mental retardation in iodine deficient areas, the IQ in those areas went up a full 15 points, and on average across the whole nation about 3 points. Cool stuff.
Hopefully you eat enough salt to become intelligent enough to know to cut down on the salt intake becauses it causes high blood pressure.
And hypertension is thought to be a possible cause in the loss of memory and mental function later in life. The more you know.
I wonder if we're getting stupider as a result of moving away from iodized salts and towards kosher salts in cooking during the 90's and beyond.