Quote:
Originally Posted by Richard
The effects of either too much iodine or too little idoine on the human body are well documented and must always be considered.
Richard's $.02 
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First, I apologize for coming late to the party, been away for a short while.
Both hypo and hyperthyroidism can result in early menstruation.
So then remains the question, can iodine water purification tablets result in altered thyroid function? I looked for studies to link, but now that I'm out of school, they cut me off for the full length articles. I will link to the abstracts and I am sure you have better access to journals than myself.
Early study (1993) in Military Medicine noting abnormal lab values:
http://www.ncbi.nlm.nih.gov/pubmed/8...ubmed_RVDocSum
There is also an article,
'Travelers' thyrotoxicosis'. Transitory thyrotoxicosis induced by iodinated preparations for water purification. But I cannot link full article and I see "Erratum in" and "Comment in" cited on PubMed, but again cannot read said errors or comments, so I did not link this article.
Cross-Sectional survey of Peace Corps workers in Africa noting abnormal lab values and goiter, resolving upon removal of excess iodine (This was due to excess iodine from a water filter):
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
A study conducted looked at short term and long-term effects of iodinated water in the US Space Program. Conclusions were that therapeutic doses of iodine were consumed, enough for a transient change in thyroid function, but no long term effects were found:
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
I could not find any direct evidence to answer this student's question, but enough evidence exists to extrapolate findings to:
Has it ever happened? "Maybe"
Could it happen? "I don't see why not"
Maybe that is a lesson in itself.
SR