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Seaweed is not something I have looked at specifically but is a good source of minerals, and some varieties contain long chain omega threes and probably lots of other things to.
From a very vague recollection adequate iodine intake stops the body taking up radioactive substances that it takes in if iodine deficient, or to particular glands including the thyroid where radioactivity does particular damage. I have not looked at this and my recollection is vague.
The Japanese had traditionally low rates of BC which have increased as they switched to more western diets, and those who moved to the US and changed diet are reported as having moved to US BC rates.
RB
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