Interestingly, at least once the censorship seemed to work for the social good: when a false rumour started that
eating iodised salt, rather than potassium iodide pills, would protect people from radiation leaks from the Fukushima Daiichi nuclear power station, the censors deleted the messages.
Today we can
eat food from around the world — we can make sure we get enough selenium by
eating a brazil nut or two (kidneys are also a good source of selenium), we can get enough iodine from
iodised salt or seaweed (selenium and iodine are the most important deficiencies in New Zealand, because of local soil conditions), and if we
eat wholefood from a variety of sources — e.g. meat, a little organ meat (once or twice a week), nuts & seeds, seafood, vegetables, and dairy (or bone broth if you don't tolerate dairy, two or three times a week)-- this will supply enough nutrition for optimum health.