There is no question that dioxin causes problems in the thyroid gland. A brand new study has just been released that illuminates this toxicity. The title of the study is "The possible roles of environmental factors and the aryl hydrocarbon receptor in the presence of thyroid diseases in Vietnam era veterans". This study is published in the journal "Current Opinion in Endocrinology and Diabetes", in press, August 5, 2011. The authors are S. W. Spaulding, et al.
The summary of the study is as follows: "The balance between Treg, Th 17 and Th 22 cells disrupted by TCDD, resembling what has been found clinically in Graves disease and Hashimoto thyroiditis, and in animal models of these diseases. By altering the immune balance in susceptible individuals, chronic TCDD exposure may influence the prevalence of autoimmune thyroid diseases".
The evidence speaks for itself.