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Related Experiment Videos

Fasting induces a decrease in serum thyroglobulin in normal subjects.

J Unger1

  • 1Department of Endocrinology, School of Medicine, Campus Erasme, Free University of Brussels, Belgium.

The Journal of Clinical Endocrinology and Metabolism
|December 1, 1988
PubMed
Summary
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Fasting reduces thyroid-stimulating hormone (TSH) and thyroid secretion, indicated by thyroglobulin (Tg) levels. These changes, along with decreased T3, suggest an adaptive response to prolonged fasting in normal subjects.

Area of Science:

  • Endocrinology
  • Metabolic Regulation
  • Thyroid Physiology

Background:

  • Fasting is known to decrease serum T3 by reducing T4 to T3 conversion.
  • The effect of fasting on TSH and thyroid secretion remains controversial.
  • Thyroglobulin (Tg) is a key secretory product of the thyroid gland, reflecting thyroid activity.

Purpose of the Study:

  • To investigate the impact of a 4-day fast on thyroid secretion, specifically measuring serum Tg.
  • To examine the correlation between serum Tg, TSH, T4, and T3 concentrations during fasting.
  • To determine if fasting alters TSH and thyroid secretion in normal individuals.

Main Methods:

  • Seven healthy subjects underwent a 4-day fast.
  • Serum concentrations of TSH, T4, T3, and Tg were measured before, during, and after the fast.

Related Experiment Videos

  • Statistical analysis, including correlation coefficients, was used to assess relationships between hormone levels.

    • Main Results:

    • Serum TSH significantly decreased during fasting (P=0.01).
    • Serum Tg levels also significantly decreased (P=0.005), alongside a marked reduction in T3 (P<0.0001).
    • Serum T4 levels did not change significantly, and all measured hormones returned to baseline post-refeeding.

    Conclusions:

    • Fasting leads to decreased TSH and thyroid secretion, as evidenced by reduced Tg levels.
    • These parallel changes in TSH, Tg, and T3 suggest an adaptive response to fasting.
    • The findings indicate that fasting impacts not only T3 but also TSH and overall thyroid secretion.