Is Sperm Quality Really Declining? The Impact on Reproductive Function

Introduction: Are You Concerned About Male Fertility?

Recently, we've been hearing more often that 'the number of male sperm has decreased compared to the past.' We were initially skeptical, but looking at multiple reports, such as the large-scale analysis published by Levine et al. in 2017 and studies targeting Asia, it is true that there are voices pointing to a global decline. However, due to regional differences and variations in analysis methods, it's best to avoid taking everything at face value. In this article, we will clearly summarize what the problem is and what we can do.

Is Sperm Count and Quality Really Declining?

As mentioned earlier, long-term data analysis primarily from Europe and the US has reported a significant decline in sperm count from the 1970s to the 2000s. Some researchers warn of the impact on future fertility. On the other hand, it is difficult to definitively state that 'all men are uniformly experiencing a decline' because differences in study subjects, examination methods, and lifestyle backgrounds affect the results.

Main Factors Thought to Reduce Sperm Quality

Diet and Nutrition

Processed meats (sausages and bacon) and trans fats are pointed out as potentially having a negative impact on sperm function. Conversely, a diet centered on vegetables, fruits, and good fats, like the Mediterranean diet, is considered favorable. Regarding soy (isoflavones), some reports suggest that excessive intake may have an effect, but there is also a view that moderate intake is not necessarily a problem.

Lifestyle, Weight, and Hormones

Obesity disrupts hormone balance and is associated with decreased testosterone and reduced sperm quality. Smoking, excessive alcohol consumption, lack of sleep, and chronic stress also have negative effects. The decline in testosterone is influenced not only by aging but also by lifestyle and environmental factors.

Environmental and Physical Factors

Endocrine disruptors such as bisphenol A and phthalates contained in plastics, excessive heat from smartphones and laptops, prolonged sauna use, and tight underwear can also put a strain on sperm. Research results on electromagnetic waves (EMF) are divided, and while excessive anxiety is unnecessary at this point, caution is required.

Daily Measures and the Role of Supplements

First, Review Your Lifestyle Habits

When we actually tried it, just by reducing processed foods and increasing vegetables and good quality protein (lean meat, fish, legumes), our physical condition and mood stabilized. Specifically, prioritize quitting smoking, moderate alcohol consumption, regular aerobic exercise and strength training, sufficient sleep, and weight management. Also, heat countermeasures such as not placing laptops on your lap and avoiding prolonged heat can be easily implemented.

Supplements as an Aid

Vitamins C and E, zinc, selenium, coenzyme Q10, and L-carnitine, and folic acid are attracting attention in research for their roles in antioxidant activity and sperm formation. However, relying solely on supplements is not recommended. First, establish a healthy diet and lifestyle, and then consider supplementation in consultation with a doctor if necessary.

When Medical Approach is Necessary

If sperm count is significantly low, there are issues with erection or ejaculation, hormonal abnormalities, or a history of illness, it is important to undergo examination by a specialist (urologist, infertility specialist). Unexplained spermatogenic dysfunction or genetic factors may be found, and treatment or ART (assisted reproductive technology) options can be proposed.

Summary

• While a global trend of declining sperm count has been pointed out, it is necessary to make a calm judgment due to individual differences and research variations.
• Processed foods, trans fats, obesity, smoking, excessive alcohol, environmental chemicals, and high temperatures are listed as risk factors.
• First, improve lifestyle habits (balanced diet, exercise, quitting smoking/moderate drinking, sleep, heat countermeasures), and consult with supplements or medical professionals as needed.
• If you are concerned, we recommend visiting a specialist early to understand your current situation through examination. We also hope you start with small lifestyle improvements.

Disclaimer: The information in this article is for general informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional before making any health-related decisions.