Elevated Blood Sugar Levels and Their Impact on Men's Sexual Health

New research reveals that even modest increases in blood sugar levels can negatively affect men's sexual health, including erectile function and sperm mobility, emphasizing the importance of metabolic health management with aging.
Recent research presented at ENDO 2025 highlights the significant influence of metabolic health factors, particularly blood sugar levels, on male reproductive and sexual function as they age. The study emphasizes that even slight increases in blood sugar — below the diabetic threshold — are associated with declines in sperm motility and erectile performance.
This long-term study tracked 117 healthy men aged 18 to 85 over six years, focusing on hormonal balance, semen quality, erectile function, and metabolic health markers such as BMI and blood sugar levels measured by HbA1c. Interestingly, while hormone levels and semen parameters generally remained within normal ranges, subtle reductions in sperm mobility and erectile function were observed among men with mildly elevated blood sugar levels.
Dr. Michael Zitzmann from the University Hospital in Muenster explained that traditional assumptions linked aging and decreasing testosterone directly to declining sexual health. However, their findings suggest that metabolic factors, especially blood sugar fluctuations, are more closely correlated with these changes.
Importantly, testosterone levels did not directly impact erectile performance but did correlate with libido. This indicates that managing blood sugar could be a vital strategy for preserving reproductive health and sexual function into older age, empowering men to adopt lifestyle modifications and medical interventions for better outcomes.
The insights from this research, part of the FAME 2.0 study, underscore that maintaining metabolic health is key for male sexual vitality. By controlling blood sugar levels and adopting healthier habits, men can potentially prevent or mitigate age-related sexual health decline.
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