By Francesca Steyn RN
When we talk about fertility, the conversation often centres on the woman, but male reproductive health plays a major role in conception and pregnancy outcomes. In around 50% of fertility cases, male factors contribute to difficulties conceiving. Understanding why sperm health matters isn't just important for couples trying to conceive; it also helps men take positive action for their own long-term health.
What do we mean by sperm health?
Sperm health isn't just about how many sperm are in a sample. It includes:
- Count: The number of sperm present
- Motility: How well sperm swim, which is essential for reaching and fertilising the egg
- Morphology: The shape and structure of sperm, which plays a role in successful fertilisation
Research shows that poor sperm health is strongly associated with reduced fertility potential and suboptimal semen parameters such as low count, reduced motility, and abnormal morphology.
Fertility isn't all about numbers
Even when sperm count appears within a "normal" range, other aspects of sperm quality can still influence the chances of natural conception. Reduced motility and abnormal morphology are more common in men experiencing fertility challenges and are associated with lower pregnancy rates.
Age can also play a role. Studies suggest that men over 40 are more likely to experience declines in overall semen quality, which may affect reproductive outcomes.
Why healthy sperm matters when not trying to conceive
Emerging evidence suggests that sperm quality may reflect broader aspects of men's health, not just fertility. One large population-based study found that men with higher-quality semen parameters tended to live longer than men with poorer semen quality. This raises the possibility that sperm health may act as a marker of overall physiological wellbeing.
Oxidative stress and sperm health
One of the most well-studied contributors to reduced sperm quality is oxidative stress. Reactive oxygen species (ROS) can impair sperm function by affecting cell membranes, leading to reduced motility and compromised fertilisation capacity. The European Society of Human Reproduction and Embryology (ESHRE) recognises oxidative stress as a significant factor in male infertility.
Supporting healthy sperm with nutrition and lifestyle
Nutrients such as vitamins C and E, folate, zinc, omega-3 fatty acids, and selenium are associated with improved sperm count, motility, and morphology. Practical tips: eat an antioxidant-rich diet including fruits, vegetables, nuts, seeds, and oily fish; maintain a healthy weight; avoid smoking, excessive alcohol, and environmental toxins; manage stress and minimise heat exposure to the testicles.
In summary
Sperm health matters not only for achieving pregnancy, but also as part of long-term health and wellbeing. Whether you're planning a family or simply want to support your reproductive wellbeing, sperm health is worth paying attention to — and it's something men can actively improve.
References
- World Health Organization. WHO Laboratory Manual for the Examination and Processing of Human Semen.
- European Society of Human Reproduction and Embryology (ESHRE). Male infertility and semen quality guidelines.
- Agarwal A, et al. Oxidative stress and its impact on male fertility. Reproductive Biology and Endocrinology.
- Jensen TK, et al. Semen quality as a predictor of lifespan. BMJ Open.
- Gaskins AJ, Chavarro JE. Diet and fertility: a review of evidence. Human Reproduction Update.
