The challenge of iodized salt

After my post on the horrors of iodine deficiency, you may be wondering why non-iodized salt even continues to exist. Why not just iodize all salt as a matter of policy?

The answer is that we're trying. Iodized salt is almost universally recognized as a public health good, but it is a surprisingly difficult thing to achieve. Getting iodine into salt is beset by a lot of logistical challenges, some genuine and some bureaucratic.

On the logistical front, salt comes from lots of places. It may be crystallized from seawater, or mined in any number of ways. It is then processed in many different factories, by companies with no particular incentive to iodize. Consumers do not see iodized salt as something worth paying extra for; most people are unaware of the severity of iodine deficiency. Some people are even put off by the chemical smell of iodized salt. Governments with limited administrative reach have trouble tracking the hundreds of small salt factories which may exist in their countries.

The problems are compounded by the administrative issues involved in iodizing salt. Iodized salt seems especially prone to ugly turf wars. For example, any number of ministries or departments could be responsible for enforcing iodization, including health, agriculture, natural resources, or commerce.

There are also a truly impressive number of boring administrative discussions about exactly how much salt ought to be iodized, and if levels ought to be standardized across countries. Do you set the levels yourself for your own country, or do you use WHO standard levels? Some countries use a lot of iodine so that when levels are averaged, the whole country looks covered despite large quantities of salt which have not been treated.

The cool thing is salt iodization is one of the few major public health problems people can address on their own. You can actually do something about it by buying a test kit and checking salt. You can report insufficiently iodized salt to the government, and complain to manufacturer. This is actually a pretty nifty thing to do with young people, as a lesson in both science and citizen activism. Some people actually carry a testing kit with them whenever they travel and routinely test the salt wherever they eat.

Check out success stories about iodized salt in Nigeria and in Kazakhstan, and some more background on iodized salt.