News | How Long-Term Alcohol Use Harms Men's Metabolic and Reproductive Health
The effects of alcohol use, especially long-term use, on men's health are receiving increasing attention in medical research. In a review published in Metabolites, Italian researchers examined how alcohol affects men's metabolic and reproductive health, focusing on its negative effects on liver function, lipid metabolism, and testosterone production. The review highlighted the health risks of chronic alcohol use and called for further research, particularly into individual differences, genetic susceptibility, and other potential factors.
Effects of Alcohol on Metabolic Health
Alcohol is first absorbed in the stomach and small intestine, then metabolized in the liver through oxidative and nonoxidative pathways. In oxidative metabolism, alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) convert alcohol into acetaldehyde and acetate. This process produces reactive oxygen species (ROS), causing oxidative stress and inflammation. Nonoxidative pathways produce metabolites such as fatty acid ethyl esters and phosphatidylethanol.
Chronic alcohol use is closely associated with metabolic syndrome, type 2 diabetes, fatty liver disease, alcoholic liver disease, and other conditions. Alcohol-induced insulin resistance, mitochondrial dysfunction, and oxidative stress can disrupt lipid metabolism and promote inflammation. Although some studies suggest moderate alcohol intake may reduce the risk of type 2 diabetes, heavy consumption can seriously impair liver function and worsen metabolic disorders by disrupting insulin signaling, increasing oxidative stress, and dysregulating cellular pathways.
Chronic alcohol-related liver damage has complex mechanisms, including excess acetaldehyde production, oxidative stress, abnormal lipid metabolism, and apoptosis. Long-term heavy alcohol use may also disrupt the gut microbiome and increase intestinal permeability, leading to liver-cell apoptosis and alcoholic hepatitis.
Alcohol and Testosterone Production
Alcohol consumption directly affects testosterone production, particularly by disrupting the hypothalamic-pituitary-gonadal (HPG) axis. Acute alcohol use may lower testosterone levels by depleting NAD+, suppressing gonadotropins, and disrupting steroidogenesis. Long-term use usually lowers testosterone and is closely associated with liver damage and hormonal imbalance, including elevated estrogen.
A meta-analysis found that men with long-term alcohol use had serum testosterone levels 4.86 nmol/L lower than nondrinkers. Alcohol misuse, particularly binge drinking, also often causes excess estrogen and signs of feminization in men. The effects of alcohol on testosterone production in adolescents remain unclear; because adolescence is a critical period for male reproductive development, further research is urgently needed.
Effects of Alcohol on Male Reproductive Health
Alcohol's effects on male fertility primarily involve spermatogenesis. Acute alcohol use may interfere with sperm production by increasing oxidative stress and impairing Sertoli cell function. Chronic use is closely linked to poorer semen quality, including reduced semen volume, sperm concentration, and normal morphology. Although some evidence suggests moderate alcohol intake may have antioxidant effects, this remains uncertain and context-dependent.
Long-term alcohol misuse causes more pronounced testicular damage and may lead to arrested spermatogenesis and Sertoli-cell-only syndrome. However, the damage may be reversible after alcohol use stops.
A major limitation of current research is the inability to exclude confounding factors such as smoking, drug use, and comorbidities, making it difficult to draw firm conclusions about alcohol's effects on reproductive health.
Conclusions and Outlook
The review highlighted the negative effects of chronic alcohol use on metabolic health and male reproductive function, particularly hormonal imbalance, impaired spermatogenesis, and poorer semen quality. Alcohol misuse also contributes to alcohol-associated fatty liver disease by increasing intestinal permeability and causing liver inflammation, mitochondrial dysfunction, and oxidative stress.
The findings indicate that clearly distinguishing the effects of moderate, acute, and chronic alcohol use and adopting evidence-based health strategies are important for reducing alcohol-related health risks. The researchers also called for further studies to guide clinical treatment and prevention.
News | How Long-Term Alcohol Use Harms Men's Metabolic and Reproductive Health
News | How Long-Term Alcohol Use Harms Men's Metabolic and Reproductive Health
The effects of alcohol use, especially long-term use, on men's health are receiving increasing attention in medical research. In a review published in Metabolites, Italian researchers examined how alcohol affects men's metabolic and reproductive health, focusing on its negative effects on liver function, lipid metabolism, and testosterone production. The review highlighted the health risks of chronic alcohol use and called for further research, particularly into individual differences, genetic susceptibility, and other potential factors.
Effects of Alcohol on Metabolic Health
Alcohol is first absorbed in the stomach and small intestine, then metabolized in the liver through oxidative and nonoxidative pathways. In oxidative metabolism, alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) convert alcohol into acetaldehyde and acetate. This process produces reactive oxygen species (ROS), causing oxidative stress and inflammation. Nonoxidative pathways produce metabolites such as fatty acid ethyl esters and phosphatidylethanol.
Chronic alcohol use is closely associated with metabolic syndrome, type 2 diabetes, fatty liver disease, alcoholic liver disease, and other conditions. Alcohol-induced insulin resistance, mitochondrial dysfunction, and oxidative stress can disrupt lipid metabolism and promote inflammation. Although some studies suggest moderate alcohol intake may reduce the risk of type 2 diabetes, heavy consumption can seriously impair liver function and worsen metabolic disorders by disrupting insulin signaling, increasing oxidative stress, and dysregulating cellular pathways.
Chronic alcohol-related liver damage has complex mechanisms, including excess acetaldehyde production, oxidative stress, abnormal lipid metabolism, and apoptosis. Long-term heavy alcohol use may also disrupt the gut microbiome and increase intestinal permeability, leading to liver-cell apoptosis and alcoholic hepatitis.
Alcohol and Testosterone Production
Alcohol consumption directly affects testosterone production, particularly by disrupting the hypothalamic-pituitary-gonadal (HPG) axis. Acute alcohol use may lower testosterone levels by depleting NAD+, suppressing gonadotropins, and disrupting steroidogenesis. Long-term use usually lowers testosterone and is closely associated with liver damage and hormonal imbalance, including elevated estrogen.
A meta-analysis found that men with long-term alcohol use had serum testosterone levels 4.86 nmol/L lower than nondrinkers. Alcohol misuse, particularly binge drinking, also often causes excess estrogen and signs of feminization in men. The effects of alcohol on testosterone production in adolescents remain unclear; because adolescence is a critical period for male reproductive development, further research is urgently needed.
Effects of Alcohol on Male Reproductive Health
Alcohol's effects on male fertility primarily involve spermatogenesis. Acute alcohol use may interfere with sperm production by increasing oxidative stress and impairing Sertoli cell function. Chronic use is closely linked to poorer semen quality, including reduced semen volume, sperm concentration, and normal morphology. Although some evidence suggests moderate alcohol intake may have antioxidant effects, this remains uncertain and context-dependent.
Long-term alcohol misuse causes more pronounced testicular damage and may lead to arrested spermatogenesis and Sertoli-cell-only syndrome. However, the damage may be reversible after alcohol use stops.
A major limitation of current research is the inability to exclude confounding factors such as smoking, drug use, and comorbidities, making it difficult to draw firm conclusions about alcohol's effects on reproductive health.
Conclusions and Outlook
The review highlighted the negative effects of chronic alcohol use on metabolic health and male reproductive function, particularly hormonal imbalance, impaired spermatogenesis, and poorer semen quality. Alcohol misuse also contributes to alcohol-associated fatty liver disease by increasing intestinal permeability and causing liver inflammation, mitochondrial dysfunction, and oxidative stress.
The findings indicate that clearly distinguishing the effects of moderate, acute, and chronic alcohol use and adopting evidence-based health strategies are important for reducing alcohol-related health risks. The researchers also called for further studies to guide clinical treatment and prevention.
Source:
Collected online