Male Fertility 1/2: Understanding and Taking Action

This is Part 1 of our 2-part series on fertility. Next week, we'll explore female fertility with the same approach.

When a couple struggles to conceive, the investigation often focuses first on the woman. Yet, in 50% of infertility cases, the male factor is involved.

And this is not marginal. A meta-analysis published in 2022 and released in 2023 reported a 51.6% decline in mean sperm concentration and a 62.3% decline in total sperm count between 1973 and 2018 among unselected men.

There are two main categories of causes:

On one hand, medical or structural causes that require specialized care: varicocele, erectile dysfunction, infections, obstructions of the vas deferens, genetic abnormalities, autoimmune disorders, etc. These situations must be evaluated by a qualified healthcare professional (urologist, andrologist).

On the other hand, modifiable factors related to lifestyle and environment: hormonal balance, inflammation, oxidative stress, nutritional deficiencies, exposure to endocrine disruptors.

This article focuses on these actionable levers. Because optimizing biological terrain is essential to support fertility.

We will explore what impairs male fertility, which biomarkers help evaluate it, and what concrete changes you can implement starting today.

The good news? Sperm renews every 72 to 90 days. Changes today, measurable results in 3 months.

What we measure: the sperm analysis

A sperm analysis evaluates several parameters:

• Ejaculate volume: amount of semen released per ejaculation

• Concentration: number of sperm per mL

• Motility: ability to move effectively

• Vitality: number of live sperm

• Morphology: percentage of normal forms

An abnormal sperm analysis does not mean there's no room for improvement. It means you need to investigate further.

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The key factors that impair male fertility

1. Hormonal imbalances

Male fertility depends on precise hormonal balance:

• FSH: supports spermatogenesis (elevated = possible testicular failure)

• LH: stimulates testosterone production

• Testosterone (total and free): essential for spermatogenesis and libido

• Estradiol: regulates (in small amounts) sperm maturation. If elevated: brake on the reproductive axis

• Prolactin: elevated = brake on the reproductive axis

A fertility issue is not just a mechanical problem. It can reflect hormonal imbalance.

Lucis Biomarkers: Total/free testosterone, SHBG, FSH, LH, Prolactin, Estradiol.

2. Thyroid function

A disrupted thyroid, even subclinical, can impair sperm motility, concentration, and overall hormonal balance.

Consider testing if you experience: chronic fatigue, weight fluctuations, mood disorders, decreased libido, cold sensitivity, dry skin.

Lucis Biomarkers: TSH, Free T3, Free T4.

3. Oxidative stress

Sperm are particularly vulnerable to oxidative stress (excess free radicals).

Consequences: impaired motility, damage to cell membranes, sperm DNA fragmentation, overall quality decline.

Sources: smoking (cigarettes, cannabis), alcohol, pollution, diet poor in antioxidants, chronic inflammation, sleep deprivation, chronic stress, excessive heat.

Lucis Biomarkers: Cortisol (in chronic excess, inhibits the reproductive axis), Homocysteine (indirect marker of oxidative stress and B9/B12 deficiency).

4. Inflammation and metabolic health

Men with low sperm count are more likely to have overweight or obesity, insulin resistance, metabolic syndrome, low-grade inflammation, and dyslipidemia. Adipose tissue produces pro-inflammatory cytokines and converts testosterone into estradiol.

Lucis Biomarkers: High-sensitivity CRP, Fasting glucose, HbA1c, Lipid profile (cholesterol, LDL, HDL, triglycerides).

5. Nutritional deficiencies

The body cannot produce quality sperm without sufficient building blocks.

Essential nutrients:

• Zinc: spermatogenesis, DNA structure, motility

• Selenium: antioxidant, thyroid function

• Magnesium: cortisol regulation, energy metabolism

• Vitamin D: supports reproductive function, improves motility and morphology

• Folate (B9) and B12: cell division, DNA synthesis

• Omega-3 (EPA/DHA): sperm membrane, inflammation reduction

Lucis Biomarkers: Vitamin D (25-OH), Zinc, Magnesium, Ferritin, Homocysteine.

6. Environmental exposures

Endocrine disruptors interfere with the hormonal system by mimicking, blocking, or disrupting natural hormones.

Main disruptors:

• BPA (Bisphenol A): food plastics, cans, receipts

• Phthalates: cosmetics, synthetic fragrances, food packaging, soft plastic toys

• Certain pesticides

• PFAS (Per- and Polyfluoroalkyl Substances): non-stick cookware, fast-food packaging, waterproof textiles, some cosmetics

Other exposures to consider:

• Occupational exposures (paints, solvents, heavy metals)

• Repeated excessive heat (hot baths, saunas, laptop on lap, tight clothing, mobile phone in front pocket)

Data do not always establish direct causality for each isolated molecule. However, they clearly justify reducing overall toxic load during preconception.

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Actionable levers

Sperm renews every 72 to 90 days. By acting now on diet, lifestyle, and environment, you can observe measurable improvements in sperm quality within 3 months.

1. Nutrition

Favor:

• Quality proteins: organic eggs, fatty fish, grass-fed meat, pasture-raised poultry

• Cruciferous vegetables: broccoli, kale, Brussels sprouts

• Antioxidants: berries, citrus fruits, peppers, spinach, tomatoes, pomegranate

• Healthy fats: fatty fish, avocados, nuts, seeds, olive oil

• Zinc: oysters, pumpkin seeds, eggs

• Selenium: Brazil nuts (1/day)

Limit or avoid: refined sugars, ultra-processed foods, alcohol.

2. Lifestyle: optimize biological terrain

Sperm quality also depends on your daily lifestyle: sleep, physical activity, stress management, and heat exposure directly influence spermatogenesis.

Avoid excessive heat. Testicles must remain 2 to 3 °C below body temperature to produce quality sperm.

• No prolonged hot baths or saunas

• No laptop on lap

• Avoid carrying your phone in the front pocket of your pants or jeans

• Loose underwear

Regular, moderate exercise. Physical activity improves testosterone and sperm quality. Overtraining (more than 10h/week) has the opposite effect.

Sleep. Testosterone production is optimized by good sleep architecture. Aim for 7 to 9h/night with a regular sleep-wake schedule.

Tobacco, cannabis, alcohol. Smoking generates oxidative stress that damages sperm DNA. Alcohol reduces testosterone.

• Complete cessation of tobacco and cannabis 3 months before conception

• Alcohol: max 1 to 2 drinks per week

Stress management. Chronically elevated cortisol decreases testosterone and reduces spermatogenesis. Try stress management techniques that work for you: meditation, conscious breathing, yoga, nature walks.

3. Reduce endocrine disruptors

It's impossible to completely eliminate exposure to endocrine disruptors. However, reducing overall toxic load can significantly impact fertility. A few simple daily habits can limit this exposure.

Kitchen. Food containers and how you heat or store food directly influence your exposure.

• Replace plastic containers with glass or stainless steel

• Never heat or microwave food in plastic

• Choose organic foods, especially for the most treated fruits and vegetables

• Wash all fruits and vegetables thoroughly

Bathroom. Cosmetics and hygiene products are absorbed through the skin and may contain endocrine disruptors.

• Choose cosmetics without parabens, phthalates, synthetic fragrances

• Read labels: avoid "fragrance" or "parfum" (sources of phthalates)

Home. Indoor air and everyday objects can concentrate pollutants.

• Filter tap water (pitcher or tap filter)

• Avoid non-stick cookware (opt for stainless steel, cast iron, ceramic)

• Air out daily (10 to 15 min, even in winter)

• Vacuum regularly (disruptors accumulate in dust)

Conclusion

Male fertility depends on multiple factors: hormones, nutrition, inflammation, oxidative stress, toxins, lifestyle.

The good news: most are modifiable. Sperm renews in 90 days. Concrete changes today, measurable results in 3 months.

At Lucis, we analyze over 40 biomarkers related to male fertility: sex hormones, thyroid, inflammation, metabolism, micronutrients. Because optimizing fertility starts with understanding your biological terrain.

References

The information provided in this article is for educational purposes only and does not substitute medical advice, diagnosis, or treatment. Consult a qualified healthcare professional for personalized care.

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