Endocrinol Metab.  2016 Jun;31(2):213-222. 10.3803/EnM.2016.31.2.213.

Clinical Relevance of Environmental Factors in the Pathogenesis of Autoimmune Thyroid Disease

Affiliations
  • 1Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands. w.m.wiersinga@amc.uva.nl

Abstract

Genetic factors contribute for about 70% to 80% and environmental factors for about 20% to 30% to the pathogenesis of autoimmune thyroid disease (AITD). Relatives of AITD patients carry a risk to contract AITD themselves. The 5-year risk can be quantified by the so-called Thyroid Events Amsterdam-score, based on serum thyroid-stimulating hormone, thyroid peroxidase (TPO)-antibodies and family history. Subjects at risk may ask what they can do to prevent development of AITD. This review summarizes what is known about modulation of exposure to environmental factors in terms of AITD prevention. To stop smoking decreases the risk on Graves disease but increases the risk on Hashimoto disease. Moderate alcohol intake provides some protection against both Graves and Hashimoto disease. Low selenium intake is associated with a higher prevalence of thyroid autoimmunity, but evidence that selenium supplementation may lower TPO antibodies and prevent subclinical hypothyroidism remains inconclusive. Low serum vitamin D levels are associated with a higher prevalence of TPO antibodies, but intervention studies with extra vitamin D have not been done yet. Stress may provoke Graves hyperthyroidism but not Hashimoto thyroiditis. Estrogen use have been linked to a lower prevalence of Graves disease. The postpartum period is associated with an increased risk of AITD. Taking together, preventive interventions to diminish the risk of AITD are few, not always feasible, and probably of limited efficacy.

Keyword

Autoimmune thyroid disease; Environment; Smoking; Alcohol; Selenium; Vitamin D; Infection; Estrogens; Stress

MeSH Terms

Antibodies
Autoimmunity
Estrogens
Graves Disease
Hashimoto Disease
Humans
Hyperthyroidism
Hypothyroidism
Iodide Peroxidase
Postpartum Period
Prevalence
Selenium
Smoke
Smoking
Thyroid Diseases*
Thyroid Gland*
Thyrotropin
Vitamin D
Antibodies
Estrogens
Iodide Peroxidase
Selenium
Smoke
Thyrotropin
Vitamin D

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