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Hormonal changes when falling in love.

Donatella Marazziti1, Domenico Canale

  • 1Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, University of Pisa, via Roma, 67, 56100 Pisa, Italy. dmarazzi@psico.med.unipi.it

Psychoneuroendocrinology
|June 5, 2004
PubMed
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Falling in love triggers temporary hormonal shifts, including elevated cortisol and altered testosterone levels, particularly in men. These changes normalize over time, suggesting a link to the initial stages of pair bonding.

Area of Science:

  • Neuroendocrinology
  • Human Pair Bonding
  • Social Neuroscience

Background:

  • Falling in love is a crucial initial step in human pair formation.
  • The neuroscientific investigation into the hormonal underpinnings of falling in love is nascent.
  • Limited data exists on the endocrine changes associated with the early stages of romantic relationships.

Purpose of the Study:

  • To investigate hormonal fluctuations in individuals who have recently fallen in love.
  • To compare hormone levels (pituitary, adrenal, gonadal) between newly in-love individuals and controls (single or long-term relationships).
  • To explore sex-specific hormonal responses during the early phase of romantic attachment.

Main Methods:

  • Hormone levels were measured in 24 subjects who recently fell in love (within six months).

Related Experiment Videos

  • Comparison groups included 24 single subjects and 24 subjects in long-term relationships.
  • Evaluated hormones: Follicle-Stimulating Hormone (FSH), Luteinizing Hormone (LH), estradiol, progesterone, dehydroepiandrosterone sulfate (DHEAS), cortisol, testosterone, and androstenedione.

    • Main Results:

    • Subjects in love exhibited significantly higher cortisol levels compared to controls.
    • Men in love showed lower FSH and testosterone levels; women in love displayed higher testosterone levels.
    • Estradiol, progesterone, DHEAS, and androstenedione levels did not differ significantly between groups.

    Conclusions:

    • Falling in love induces transient, sex-specific hormonal changes, notably increased cortisol and altered testosterone.
    • Elevated cortisol and reduced FSH in early love may indicate heightened arousal and stress responses.
    • Hormonal shifts normalize within 12-24 months, suggesting these changes are specific to the initiation phase of pair bonding.