One possible cause for Iodine Deficiency

It would seem from


http://biomedx.com/microscopes/rrintro/rr4.html

that
"MINERAL ASSIMILATION is affected by pH. Minerals have different pH levels at which they can be assimilated into the body. Minerals on the lower end of the atomic scale can be assimilated in a wider pH range, and minerals higher up on the scale require a narrower and narrower pH range in order to be assimilated by the body. For example….

Sodium and magnesium have wide pH assimilation ranges.
It narrows somewhat for calcium and potassium.
Narrows more for manganese and iron.
More for zinc and copper.
More for iodine.
Iodine, which is high up on the atomic scale, requires near perfect pH for its assimilation into the body.

Iodine you may know, is one of the most important minerals for proper functioning of the THYROID. But, the thyroid doesn't get access to Iodine unless the body pH is near perfect. "