The disorders induced by iodine deficiency affect at least one billion
people. Because ofits effects on brain development, iodinedeficiency is
the single most preventable cause of mental retardation in the world.
Therefore, the United Nations and the Heads of State of almost all the
world's countries represented at the Summit for Children in 1990 adopted
resolutions to eradicate the disorders induced by iodine deficiency
(IDD) by the year 2000. For geological and socio-economic reasons, most
of the populations affected by iodine deficiency disorders live in
isolated and usually mountainous areas, in pre- industrialized parts
ofthe world. The problem of iodine deficiency in Europe has been greatly
underestimated in the last decades. After the remarkable studies on the
effects of iodine deficiency and their prevention and correction in
Switzerland, IDD was generally considered no longer a significant public
health problem in Europe. However, surveys carried out in the early
1980's under the auspices of the European Thyroid Association, clearly
demonstrated the persistence of moderately or even severely affected
areas. These surveys also highlighted the lack ofinformation about large
parts ofEurope, especially its eastern part. It is only quite recently,
following major changes in international relations and thanks to the
support of UNICEF, WHO, the International Council for the Control of
Iodine Deficiency Disorders and the European Thyroid Association, that
more extensive surveys have been conducted in several parts of Europe
hitherto almost unexplored. These surveys showed that most European
countries were iodine deficient.