Obesity and male infertility

Area of Science:

• Reproductive Endocrinology
• Obesity Medicine
• Male Infertility Research

Background:

• Rising obesity rates correlate with declining male reproductive health.
• Obesity is increasingly recognized as a significant factor contributing to male infertility.

Purpose of the Study:

• To review the multifaceted effects of obesity on male fertility.
• To elucidate the underlying mechanisms of obesity-induced reproductive impairment.
• To evaluate the efficacy of treatments, particularly weight loss, for male infertility in obese individuals.

Main Methods:

• Comprehensive literature review of studies investigating obesity and male reproductive parameters.
• Analysis of hormonal assays, semen analyses, and sperm DNA integrity tests in relation to body mass index.
• Examination of clinical outcomes following weight loss interventions.

Main Results:

• Obesity disrupts the hypothalamic-pituitary-gonadal axis, leading to hypogonadotropic, hyperestrogenic hypogonadism.
• Adipose tissue factors (leptin, adipokines) influence testosterone levels and systemic inflammation, increasing oxidative stress and sperm DNA damage.
• Elevated testicular temperature and inflammation impair spermatogenesis; however, effects on fertility parameters are variable, potentially due to comorbidities.

Conclusions:

• Obesity exerts detrimental effects on male fertility via interconnected biological pathways.
• Weight loss outcomes for restoring male reproductive potential are inconsistent, highlighting the need for further investigation.
• Large-scale, randomized controlled trials are essential to define optimal therapeutic strategies for obese men experiencing infertility.