My allergy/immunology doctor told me recently that 50 years ago thyroid dysfunction was considered rare. While it is quite possible that many (women) with thyroid problems went undetected, he claims that, today, environmental factors play a huge role in the soaring rate of thyroid dysfunction.
The Endocrine Society released a statement on Endocrine-Disrupting Chemicals (EDCs) specifically listing obesity, diabetes, female reproduction, male reproduction, hormone-sensitive cancers in females, prostate cancer in males, thyroid, and neurodevelopment and neuroendocrine systems as being affected biological aspects of being exposed to EDCs (see source below). EDCs are found in many household and industrial products. In sensitive individuals (including children and women of reproductive age) interfere with the synthesis, secretion, transport, binding, action, or elimination of natural hormones in the body and for the maintenance of homeostasis (normal cell metabolism). Much of our food now is produced by agribusiness (highly processed, laced with agrochemicals…)
If there are indeed more and more people, including children, with thyroid dysfunction and if it is 'proven' that the 'traditional approach' with synthetic T4 (levo) no longer works well because patients' bodies cannot transform T4 to T3 any more, it may well mean that we’ve reached a new stage in the evolution of this EDC-related disease. Denying the efficacy of medicines like T3 is just one way of putting one’s head in the sand - and protecting the status quo.
Talking about the real reasons for the epidemic may not cure us but it can help us help ourselves by getting 'clean' food for ourselves and our children, food that is not laced with poison and stripped of its natural nutrients.
Gore AC, Chappell VA, Fenton SE, Flaws JA, Nadal A, Prins GS, Toppari J, Zoeller RT (December 2015). "Executive Summary to EDC-2: The Endocrine Society's Second Scientific Statement on Endocrine-Disrupting Chemicals". Endocrine Reviews. 36 (6): 593–602. doi:10.1210/er.2015-1093. PMID 26414233.