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Thyroid function in humans with morbid obesity
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DOI：10.1089/thy.2006.16.73.png)
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Morbidly obese subjects may present with abnormal thyroid function tests but the reported data are scarce. Therefore, we studied the thyroid parameters in 144 morbidly obese patients, 110 females and 34 males, to assess the prevalence of hypothyroidism. Eleven percent (11.8%) carried the diagnosis of hypothyroidism and were undergoing levothyroxine (LT4) replacement therapy, 7.7% had newly diagnosed subclinical hypothyroidism, 0.7% had subclinical hyperthyroidism and 7.7% were euthyroid with positive antibodies (anti-thyroid peroxidase antibodies [TPOAb]). From the 144 subjects, we selected a cohort of 78 euthyroid subjects with negative TPOAb, who did not receive LT4 replacement or suppression therapy (the experimental group) and compared them to 77 normal-weight euthyroid subjects, TPOA-negative, matched for age and gender who served as controls. The experimental group had higher serum levels of triiodothyronine (T-3), thyroxine (T-4), free triiodothyronine (FT3) and thyrotropin (TSH) compared to the control group. Serum TSH concentration was associated with fasting serum insulin levels and insulin resistance but not with serum leptin levels, body mass index (BMI), fat mass, and lean body mass. In conclusion, in morbidly obese individuals, the prevalence of overt and subclinical hypothyroidism was high (19.5%). The morbidly obese subjects have higher levels of T-3, FT3, T-4, and TSH, probably the result of the reset of their central thyrostat at higher level.
Keyword:
HUMAN LEPTIN
WEIGHT-LOSS
INSULIN SENSITIVITY
THYROTROPIN TSH
BODY-WEIGHT
HORMONE
ENDOCRINE
NEUROENDOCRINE
STARVATION
PROLACTIN
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