Nikhil Prasad Fact checked by:Thailand Medical News Team Jun 30, 2026 43 minutes ago
Medical News: Scientists Discover a Critical Link Between Liver Health and Male Reproduction
In a major scientific development, researchers have uncovered strong evidence that liver disease may play a direct and damaging role in male fertility and hormone balance. The findings point to a newly recognized biological connection known as the “liver–testis axis,” where the liver and reproductive organs influence each other in ways previously underestimated.
New research reveals how liver disease can directly lower testosterone and damage male fertility
The research was conducted by scientists from the Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences (Beijing, China), along with the Graduate School of China Academy of Chinese Medical Sciences (Beijing, China) and the Graduate School of Hebei University of Chinese Medicine (Shijiazhuang, China).
Liver Disease May Quietly Lower Testosterone
Metabolic dysfunction-associated steatotic liver disease (MASLD), a condition affecting nearly one in three adults globally, is now being linked to declining testosterone levels in men. Researchers found that when the liver becomes stressed or fatty, it begins releasing harmful signals into the bloodstream.
One of the most important changes involves a drop in sex hormone-binding globulin (SHBG), a protein made by the liver that helps carry testosterone in the body. When SHBG levels fall, less testosterone is available for use, even if total hormone levels appear normal.
At the same time, the diseased liver produces higher levels of inflammatory substances such as IL-1β, IL-6, and TNF-α. These molecules directly interfere with the function of Leydig cells in the testes—the very cells responsible for producing testosterone—ultimately reducing hormone output and impairing reproductive health.
Hormonal Disruption and Sperm Damage
The study also highlights the role of a liver-derived hormone called FGF21. While it is normally involved in regulating metabolism, elevated levels—common in liver disease—have been linked to lower testosterone in men.
Laboratory evidence shows that FGF21 can influence sperm health by altering energy production, reducing oxidative stress, and even affecting hormone production depending on the biological context. In some cases, it improves sperm movement, but in others, it suppresses testosterone production, revealing a complex and double-edged role.
This
Medical News report underscores that liver dysfunction can extend far beyond digestion and metabolism, reaching into the core of male reproductive function.
The Reverse Loop: Low Testosterone Worsens Liver Damage
Importantly, the relationship works both ways. Testosterone plays a protective role in maintaining healthy liver metabolism. When testosterone levels drop, fat accumulation in the live
r increases, worsening conditions like MASLD.
Animal studies show that removing testosterone leads to rapid fat buildup in the liver, while restoring the hormone can reverse some of the damage. Clinical observations in men mirror these findings, with low testosterone strongly linked to more severe liver disease.
Shared Drivers Create a Vicious Cycle
Researchers emphasize that several common factors fuel both liver disease and reproductive dysfunction. These include insulin resistance, chronic inflammation, obesity and excess visceral fat, and oxidative stress that damages cells.
These factors act together to harm both the liver and testes at the same time. Toxic fat molecules and inflammatory signals disrupt hormone production while also worsening liver injury, creating a self-perpetuating cycle that becomes increasingly difficult to break.
Why This Matters for Men’s Health
The discovery of the liver–testis axis has major implications for how doctors approach male health. It suggests that treating liver disease may also improve fertility and hormone levels—and vice versa.
Men diagnosed with liver conditions may benefit from hormone screening, while those with unexplained low testosterone could require liver evaluation. This integrated approach could lead to earlier diagnosis and more effective treatments.
Conclusion
The emerging evidence linking liver disease to male reproductive dysfunction represents a significant shift in medical understanding. Rather than being separate conditions, liver health and testosterone levels are closely connected through shared metabolic and inflammatory pathways. This connection creates a harmful cycle in which liver damage lowers hormone production, and reduced hormone levels further worsen liver function. Breaking this cycle will require a more comprehensive approach that targets both metabolic health and hormonal balance at the same time. Future research is expected to provide clearer answers and lead to improved treatment strategies that can better protect both liver function and male reproductive health over the long term.
The study findings were published in the peer reviewed International Journal of Molecular Sciences
https://www.mdpi.com/1422-0067/27/13/5873
For the latest on the liver–testis axis discovery, keep on logging to Thailand
Medical News.
Read Also:
https://www.thailandmedical.news/articles/reproductive-medicine
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