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The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
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Sex-differential testosterone response to long-term weight loss.

Malgorzata M Brzozowska1,2,3, Dana Bliuc4,5, Artur Mazur6

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Weight loss improves testosterone in men but decreases it in women, particularly after bariatric surgery. These hormonal shifts, including pituitary hormone changes, may influence metabolic health and warrant further investigation in postmenopausal women.

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Area of Science:

  • Endocrinology
  • Metabolic Surgery
  • Obesity Medicine

Background:

  • Obesity is linked to gonadal dysfunction, a common issue for individuals undergoing weight loss interventions.
  • Understanding the impact of weight loss on sex hormones and other endocrine axes is crucial for managing comorbidities associated with obesity.

Purpose of the Study:

  • To investigate the incremental effects of weight loss on gonadal axes in both men and women over a 3-year period.
  • To compare changes in sex hormones between dietary interventions and various bariatric procedures (RYGB, SG, LAGB).
  • To assess alterations in the corticotropic, somatotropic, and thyroid axes following weight loss interventions.

Main Methods:

  • A prospective, observational study involving 61 adults with a Body Mass Index (BMI) >30 kg/m².
  • Endocrine parameters were measured at baseline and at six time points over 36 months.
  • Changes in hormones were analyzed in relation to the amount of weight lost and compared across different weight loss interventions.

Main Results:

  • Each kilogram of weight lost correlated with a 0.6% increase in total testosterone in men and a 0.8% decrease in women.
  • In women, bariatric surgery (RYGB, SG) led to significant reductions in total testosterone and free androgen index (FAI) compared to dietary intervention.
  • Weight loss was associated with a decline in adrenocorticotropic hormone and an increase in insulin-like growth factor-1 across the cohort.

Conclusions:

  • Hormonal changes, particularly testosterone reduction in women post-bariatric surgery, are proportional to weight loss and independent of age or menopausal status.
  • Further research is needed to explore the impact of androgen reduction on functional and cognitive status in postmenopausal women.
  • Observed alterations in pituitary hormones may contribute to the metabolic benefits of bariatric surgery.