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Related Experiment Videos

Thyroid function in humans with morbid obesity.

Marina A Michalaki1, Apostolos G Vagenakis, Aggeliki S Leonardou

  • 1Division of Endocrinology, Department of Medicine, University Hospital, Patras, Greece.

Thyroid : Official Journal of the American Thyroid Association
|February 21, 2006
PubMed
Summary

Morbidly obese individuals have a high prevalence of hypothyroidism. These individuals also exhibit elevated thyroid hormone levels (T3, T4, FT3) and TSH, suggesting a central thyrostat reset.

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Area of Science:

  • Endocrinology
  • Obesity Medicine
  • Thyroidology

Background:

  • Thyroid function abnormalities are reported in morbid obesity, but data are limited.
  • Understanding thyroid parameters in this population is crucial for clinical management.

Purpose of the Study:

  • To assess the prevalence of hypothyroidism in morbidly obese patients.
  • To compare thyroid hormone levels and TSH in morbidly obese versus normal-weight individuals.

Main Methods:

  • Studied thyroid parameters in 144 morbidly obese patients.
  • Compared a cohort of 78 euthyroid morbidly obese subjects to 77 normal-weight controls.
  • Assessed serum T3, T4, FT3, TSH, insulin, leptin, BMI, and body composition.

Main Results:

Related Experiment Videos

  • Prevalence of overt and subclinical hypothyroidism was 19.5% in morbidly obese subjects.
  • Morbidly obese individuals showed higher serum T3, T4, FT3, and TSH compared to controls.
  • TSH levels correlated with insulin resistance but not BMI or body composition.

Conclusions:

  • Morbid obesity is associated with a high prevalence of hypothyroidism.
  • Elevated thyroid hormones and TSH in morbid obesity may indicate a central thyrostat reset.
  • Thyroid dysfunction in obesity warrants further investigation, particularly regarding insulin resistance.