How Weight Loss Can Improve Male Fertility: From Lifestyle Changes to GLP-1 Drugs | Research

The takeaway

Obesity impairs male fertility through hormonal imbalance, inflammation, and lipid stress, with lifestyle changes, bariatric surgery, and GLP-1 drugs showing potential to reverse these effects.

Obesity impairs sperm quality
Hormonal imbalance, inflammation, and lipid stress from obesity reduce semen quality and pregnancy rates, but weight loss interventions can reverse these effects

What the researchers found

Weight loss interventions including lifestyle modification, bariatric surgery, and GLP-1 receptor agonists can improve obesity-related male reproductive dysfunction through multiple mechanisms.

Why it matters

Male infertility is increasingly linked to the obesity epidemic. Understanding how different weight loss approaches affect fertility gives men and their doctors more treatment options.

The numbers in context

Reviews lifestyle modification, bariatric surgery, and GLP-1 RA effects on testosterone, semen quality, and reproductive outcomes. Bariatric surgery raises testosterone but may lower sperm count in some men.

How the study worked

Mini-review summarizing current evidence on the impact of weight loss interventions on male fertility outcomes.

Who was studied

Obese men with fertility concerns

What this study cannot tell us

Mini-review — does not systematically evaluate all available evidence. Most fertility studies are small and observational. Long-term effects of GLP-1 drugs on male fertility are unknown.

How to read the evidence

Mini-review of heterogeneous evidence. Weight loss benefits for male fertility are supported by multiple studies but the optimal intervention strategy is not established.

When this study was published

Published in 2025, incorporating the latest evidence on GLP-1 drugs and male reproductive health.

The bigger picture

GLP-1 drugs may have an unexpected benefit for men struggling with both obesity and infertility, adding another dimension to the expanding therapeutic profile of these medications.

Questions still open

Do GLP-1 drugs directly improve sperm quality independent of weight loss?
Which weight loss method produces the best fertility outcomes in obese men?

Common questions

How does obesity cause male infertility?

Excess fat tissue converts testosterone to estrogen, disrupting the hormonal balance needed for sperm production. Obesity also causes chronic inflammation and oxidative stress that directly damage sperm cells and reduce semen quality.

Can GLP-1 drugs improve male fertility?

Emerging evidence suggests they may, both through weight loss and possibly through direct effects on reproductive hormones. However, this is a new area of research and more studies are needed before making specific recommendations.

Read the original research

Managing obesity-related male infertility: insights from weight loss intervention.

Human reproduction (Oxford, England), 40(11), 2027-2037

View on PubMed ↗Publisher’s paper ↗

Citation

Pereira, Thairo A; Thaker, Niral; Rubez, André C; Lima, Victor F N; Bernie, Helen L; Esteves, Sandro C. (2025). Managing obesity-related male infertility: insights from weight loss intervention.. Human reproduction (Oxford, England), 40(11), 2027-2037. https://doi.org/10.1093/humrep/deaf180