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Related Experiment Videos

Hypothalamic-pituitary-thyroidal dysfunctions in anorexia nervosa.

H Tamai, K Mori, S Matsubayashi

    Psychotherapy and Psychosomatics
    |January 1, 1986
    PubMed
    Summary

    Anorexia nervosa patients exhibit altered thyroid hormone levels and hypothalamic-pituitary axis function, suggesting adaptation to starvation. Weight gain normalizes many thyroid parameters, indicating a reversible state of hypothalamic hypothyroidism.

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    Area of Science:

    • Endocrinology
    • Neuroendocrinology
    • Nutritional Psychiatry

    Background:

    • Anorexia nervosa (AN) shares clinical symptoms with hypothyroidism.
    • Previous studies reported low circulating thyroid hormones (T4, T3) in AN, but inconsistent thyroid-stimulating hormone (TSH) and thyrotropin-releasing hormone (TRH) responses.
    • The hypothalamic-pituitary-thyroid axis in AN requires further elucidation.

    Purpose of the Study:

    • To comprehensively assess thyroid function and the hypothalamic-pituitary axis in women with anorexia nervosa.
    • To investigate the impact of weight gain on thyroid parameters in AN patients.

    Main Methods:

    • Serum levels of free and total thyroid hormones (T4, T3), binding proteins (TBG, TBPA), TSH, and reverse T3 (rT3) were measured using a highly sensitive assay in 21 AN patients and normal controls.

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  • Thyroid-stimulating hormone (TSH) response to TRH was evaluated.
  • Thyroid function was reassessed in 10 AN patients after achieving weight gain.

    • Main Results:

    • AN patients displayed significantly lower serum T4, free T4, T3, free T3, TSH, TBG, and TBPA, with higher rT3 compared to controls.
    • A significant proportion of AN patients showed delayed (66%) or blunted (24%) TSH response to TRH.
    • Following weight gain, AN patients showed significant increases in T4, T3, free T3, TSH, TBG, and TBPA, with a decrease in rT3; free T4 levels remained unchanged.

    Conclusions:

    • Anorexia nervosa is associated with significant alterations in thyroid hormone levels and TSH responsiveness, indicative of hypothalamic hypothyroidism.
    • These thyroid function abnormalities in AN appear to be an adaptive response to prolonged starvation.
    • Weight restoration leads to the normalization of most thyroid parameters, suggesting the reversibility of this adaptive state.