Why Blood Sugar—Not Just Age—Is Most Important to Men's Sexual Health

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It has been discovered by new research that higher blood sugar—instead of ageing or low testosterone—is most likely to be responsible for declining sexual health in men. Learn how lifestyle changes can help.

As men age, declining sexual health is often chalked up to falling testosterone or simply “getting older.” But new research is turning that assumption on its head. A long-term study presented at ENDO 2025, the Endocrine Society’s annual meeting, shows that blood sugar levels—even below diabetic thresholds—have a significant impact on erectile function and sperm mobility.

📊New Study Links Blood Sugar to Sexual Performance

The study, carried out by Dr. Michael Zitzmann, M.D., Ph.D., of Muenster University Hospital in Germany, tracked 200 healthy men aged between 18 and 85 for six years. Nobody taking part had diabetes, cardiovascular disease, or cancer. The scientists tracked metabolic health markers like blood sugar (HbA1c) as well as testosterone, semen, and sexuality.

While testosterone levels and semen profiles were unchanging, minimal increases in blood glucose (even below the level of diabetes at 6.5% HbA1c) were related to:

• Reduced sperm motility
• Impaired erectile function
• No direct effect upon libido or testosterone-mediated desire, but possible secondary effects

This suggests that even minimal increases in blood sugar can impact male fertility and function, perhaps more than testosterone levels or age themselves.

🧠Why It Matters: Metabolic Health Affects Reproductive Health

In the past, declining sexual health among men has been blamed on age and testosterone decline. However, the FAME 2.0 study points out that metabolic health is more important.

From Dr. Zitzmann:

"These findings show that men can enhance and sustain their reproductive health through lifestyle factors and proper medical interventions."

It is all good news for tens of millions of men. Rather than resigning themselves to decline, they can treat blood sugar spikes and metabolic health to maintain sexual and reproductive function.

✅ Sustain Sexual Health Through Blood Sugar Control

Good news? Sexual decline is not a foregone conclusion, and there are numerous science-based methods for reclamation:

1. Monitor Blood Sugar Levels

Ask your doctor about your HbA1c levels, even if you’re not diabetic

Aim to stay well below the 6.5% threshold

2. Adopt a Blood Sugar-Friendly Diet

Focus on whole foods, fiber, lean protein, and healthy fats

Limit added sugars and processed carbs

3. Exercise Regularly

Physical activity improves insulin sensitivity and overall metabolic health

Even brisk walking can help regulate blood sugar

4. Get Regular Screenings

Metabolic health can change subtly—stay informed through regular check-ups

Request reproductive health checks if you're planning a family

5. Control Other Risk Factors

Both erectile dysfunction and insulin resistance are caused by smoking, alcohol, inadequate sleep, and stress

🔬Bottom Line: Aging Isn't the Enemy—Uncontrolled Blood Sugar Is

This groundbreaking study alters our knowledge of men's sexual well-being. Testosterone and age matter—but not as much as we previously believed. The real threat might be subtle blood sugar changes that insidiously undermine sexuality over time.

By addressing metabolic health early, men can maintain improved sex and fertility—even with age.

Don't let age get you down—seize your wellness now.

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