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Related Concept Videos

Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...
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Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

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Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
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Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...
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Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

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Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence...
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Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Vegan diets and hypothyroidism.

Serena Tonstad1, Edward Nathan, Keiji Oda

  • 1Department of Health Promotion and Education, School of Public Health, Loma Linda University, Loma Linda, CA 92350, USA. stonstad@llu.edu.

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Summary

Vegan diets may lower hypothyroidism risk. While not statistically significant, this dietary pattern showed a trend towards reduced hypothyroidism compared to omnivorous diets in a large study.

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Area of Science:

  • Endocrinology
  • Nutritional Science
  • Epidemiology

Background:

  • Dietary patterns excluding animal products are rarely linked to hypothyroidism but may offer protection against autoimmune conditions.
  • Investigating the association between vegetarian diets and hypothyroidism risk is crucial for public health and dietary recommendations.

Purpose of the Study:

  • To examine the relationship between vegetarian dietary patterns and the risk of developing hypothyroidism.
  • To compare hypothyroidism risk among vegan, lacto-ovo vegetarian, and omnivorous diets.

Main Methods:

  • The Adventist Health Study-2 cohort provided self-administered questionnaire data from North American church members.
  • Hypothyroidism was assessed at baseline (2002) and follow-up (2008) for prevalent and incident cases.
  • Multivariate logistic regression models analyzed diet as a determinant, controlling for demographics, salt intake, BMI, and other factors.

Main Results:

  • Overweight and obesity were associated with increased hypothyroidism odds in the prevalence study.
  • Vegan diets showed a non-statistically significant trend towards reduced hypothyroidism risk (OR 0.89) compared to omnivorous diets.
  • A lacto-ovo vegetarian diet was associated with a statistically significant increased risk (OR 1.09).
  • In the incidence study, female gender, white ethnicity, higher education, and BMI predicted hypothyroidism.
  • Following a vegan diet showed a non-statistically significant trend towards protection (OR 0.78).

Conclusions:

  • A vegan diet tended to be associated with a lower risk of hypothyroidism, contrary to initial concerns.
  • Lacto-ovo vegetarian diets were linked to a slightly increased risk of hypothyroidism.
  • Further research is warranted to confirm the protective effects of vegan diets on thyroid health.