Sperm – the other half of the fertility equation

Sperm contributes half of the genetic material needed for embryos to form. Issues related to sperm quality or function can lead to difficulties in embryo development, including issues with:

• Genetic material quality: For successful fertilisation and healthy embryo development, ideally sperm DNA should remain intact. Damage to this genetic material – whether from oxidative stress, environmental factors or ageing – can lead to chromosomal abnormalities or improper DNA variations in the embryo, increasing the risk of developmental issues or miscarriage.
• Sperm chromatin structure: Sperm chromatin, the DNA arranged within the sperm cell, must be tightly packed and properly organised to protect against DNA damage. Normal sperm chromatin structure is needed for successful fertilisation and embryo development. Abnormalities in chromatin structure can result in poor DNA repair, leading to embryo fragmentation (when tiny pieces of the cells that make up the embryo break away from the cells during division) or developmental arrest (when an embryo stops developing).
• Sperm motility (movement): Sperm with low motility (asthenospermia) may struggle to reach and fertilise the egg through natural conception or IVF. Even if fertilisation occurs, impaired motility – depending on its cause – can impact early embryonic development, as the sperm may not deliver the essential signals and factors needed for optimal growth.
• Sperm morphology: Sperm with abnormal morphology (size or shape) can affect fertilisation and embryo development. For instance, abnormal sperm may struggle to penetrate the egg, preventing fertilisation or causing abnormal embryo development. Structural defects, such as head or tail abnormalities, may prevent the sperm from properly interacting with the egg’s membrane, making fertilisation difficult in both natural conception and IVF.  Therefore, abnormal sperm morphology is indicative of low sperm quality.
• Sperm epigenetics: Sperm carries epigenetic information – modifications that influence how genes function without changing the underlying DNA sequence. Disrupted sperm epigenetics can lead to improper gene expression in the embryo, increasing the risk of developmental issues, infertility or genetic disorders.
• Oxidative stress: Sperm are vulnerable to oxidative stress – an imbalance between free radicals and antioxidants in the body – caused by factors such as smoking, alcohol consumption, environmental toxins or prolonged heat exposure. This oxidative damage can lead to DNA fragmentation, where sperm DNA strands break, potentially compromising embryo development after fertilisation.
• Paternal age: As men age, their sperm quality may gradually decline, making conception more challenging. Although men do not experience a sudden decrease in fertility like women, ageing impacts sperm health, testicular function and pregnancy outcomes. For instance, older men may produce lower-quality sperm, reducing the chances of fertilisation. Sperm from older men are also more susceptible to DNA damage, which can increase the risk of miscarriage and DNA changes contributing to genetic conditions, including autism or schizophrenia in children.

Lifestyle changes to support sperm health

While some factors affecting sperm health are beyond control, lifestyle choices can play a significant role in improving sperm quality. Making positive changes may help enhance sperm function and increase the chances of successful conception. Suggestions that may assist with sperm quality include:

Keep the testicles cool

High temperatures can damage sperm. Avoid hot tubs, saunas, car seat warmers, placing your laptop on your lap for long periods, and carrying your mobile phone in your front pocket. Wear loose-fitting underwear to keep your testicles cool and prevent overheating.

Maintain a healthy diet

A balanced diet rich in vitamins, minerals and antioxidants from fruits, vegetables, nuts, seeds, whole grains and lean proteins can help protect sperm from damage.

Additionally, fertility-boosting nutrients such as vitamins C, E and folic acid, as well as zinc and selenium, have been linked to improved sperm quality. These are present in citrus fruits, leafy greens, eggs and nuts.

Consider fertility supplements

If you’re finding it difficult to obtain enough nutrients from your diet, you may wish to consider fertility supplements. Specifically, supplements such as zinc, folic acid, selenium and CoQ10 may support sperm health. However, please consult your fertility specialist before starting any new supplements.

Engage in regular exercise

Moderate physical activity can help maintain a healthy weight and improve overall health, which supports sperm production. However, excessive exercise or overtraining can have the opposite effect, leading to reduced testosterone levels and impaired sperm quality. Additionally, prolonged cycling (over 1.5 hours) should be avoided.

Avoid smoking and limit alcohol

Smoking and vaping are associated with poor sperm quality, including reduced count and motility and increased DNA damage. Quitting should be a priority for those looking to improve fertility.

Excessive alcohol consumption can also negatively affect sperm count and quality, so keep your intake to moderate levels for optimal reproductive health.

Maintain a healthy weight

Being overweight or obese can lead to hormonal imbalances, reduced sperm quality and lowered overall fertility. Achieving and maintaining a healthy weight through diet and exercise can help improve sperm health.

Avoid exposure to toxins

Minimise exposure to harmful chemicals such as pesticides, heavy metals and industrial toxins, as they can negatively affect sperm health. Avoid contact with pollutants in some cleaning products, plastics and air pollution – and skip drinking from plastic water bottles.

If chemical exposure is unavoidable (i.e. due to your work environment), always use appropriate protective equipment, such as gloves and masks, to reduce risk.

Attend regular medical assessments

Prioritising your overall health is essential, as conditions like diabetes, high blood pressure and infections can negatively affect sperm quality. Regular check-ups with your GP or healthcare professional can help detect and manage these issues early.

If you’re trying to conceive, inform your fertility specialist about any medications or supplements you’re taking, as some may impair sperm function.

Avoid drug use

Recreational drug use, such as marijuana or anabolic steroids, can significantly reduce sperm count and quality. If you’re using these substances, consider seeking help to quit.

Manage stress

Chronic stress can negatively impact hormone levels, affecting sperm production. Consider practising relaxation techniques like meditation, yoga, deep breathing, exercise or hobbies that help you relax.

Get enough sleep

Quality sleep is essential for overall health and plays a crucial role in hormone regulation. Poor sleep can disrupt hormone levels, including testosterone, which is vital for sperm production. To support reproductive health, prioritise restful sleep and aim for 7–9 hours of quality rest each night.

Limit caffeine intake

Excessive caffeine may negatively affect sperm quality. Limiting your intake to moderate levels (one or two cups per day) can be beneficial.

When to seek help

Making these lifestyle changes can help improve sperm quality over time. However, if you and your partner have been trying to conceive without success – 12 months if the female partner is under 35 years or six months if over 35 years – it may be time to seek specialist guidance. A fertility specialist can provide personalised advice and may recommend fertility testing to gain a clearer understanding of your reproductive health.

To book an appointment with one of our fertility specialists and explore your options, call Newlife IVF on (03) 8080 8933 or schedule a consultation online via our appointments page.