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Thyroid function in bulimia nervosa

M Altemus1, M Hetherington, B Kennedy

  • 1Laboratory of Clinical Science, DIRP, NIMH, Bethesda, MD 20892-1264, USA. maltemus@helix.nih.gov

Psychoneuroendocrinology
|April 1, 1996
PubMed
Summary
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Women with bulimia nervosa exhibit significantly reduced thyroid hormone levels, particularly after abstaining from bingeing and purging. These thyroid changes normalize with sustained abstinence, indicating a reversible impact of bulimia on thyroid function.

Area of Science:

  • Endocrinology
  • Nutritional Psychiatry
  • Eating Disorders

Background:

  • Bulimia nervosa (BN) is an eating disorder characterized by binge eating and purging behaviors.
  • Thyroid hormones play a crucial role in regulating metabolism and overall physiological function.
  • Previous research suggests potential links between eating disorders and altered thyroid function.

Purpose of the Study:

  • To investigate thyroid-stimulating hormone (TSH) and thyroid hormone levels in women with BN.
  • To compare thyroid function during active illness versus abstinence from bingeing/purging.
  • To assess the impact of BN behaviors on thyroid hormone regulation.

Main Methods:

  • Evaluated TSH and thyroid hormones (T3, T4, FT4, rT3, TBG) in 18 women with BN and 27 controls.

Related Experiment Videos

  • Measurements were taken during active BN and after 7 weeks of abstinence.
  • Calculated TSH nocturnal surge in a subset of participants.

    • Main Results:

    • Patients with active BN had lower total triiodothyronine (T3) than controls.
    • After 7 weeks of abstinence, patients showed significantly lower T3, T4, FT4, and TBG compared to controls and their own active phase levels.
    • TSH nocturnal surge did not differ between groups or phases, ruling it out as a cause for hormone reduction.
    • Caloric intake correlated positively with TSH in the active BN phase, suggesting binging may stimulate thyroid activity.

    Conclusions:

    • Bulimia nervosa is associated with substantial reductions in thyroid hormone levels.
    • Abstinence from bingeing and purging for 7 weeks leads to significant decreases in thyroid hormones.
    • Thyroid hormone levels appear to be affected by the behaviors associated with bulimia nervosa.