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Dr Raelia Lew

Written by Dr Raelia Lew — Fertility Specialist & Gynaecologist

Published · 2 min read

In this article

Key takeaways

  • Advancing male age is associated with sperm DNA damage, infertility and rare spontaneous risks of genetically influenced disease in offspring.
  • Smoking is linked to infertility, miscarriage, childhood asthma and SIDS, while excess weight is associated with infertility that may improve through weight loss.
  • Men trying to conceive should ejaculate at least twice weekly, while vitamins C and E, folate and zinc support strong sperm DNA.
Healthy Sperm: Myths, Truths and Missing Links

Let’s bust some myths about male fertility

When you and your partner are trying to conceive, you want to give your baby the best start in life. From a male perspective, that means achieving the best sperm health.

There is a lot said in the media about sperm. This article is to clarify what may be a myth, what we know to be true fact and also areas where the jury are still out.

Age – Truth

While not the deal breaker that it can be for women, advancing male age is associated with sperm DNA damage, infertility and also some rare spontaneous risks of genetically influenced disease in the offspring, including schizophrenia, autism and achondroplasia. So don’t put off having your babies gentlemen.

Smoking – Truth

Smoking is very very bad for sperm. Not only is smoking associated with infertility, it has also been linked to miscarriage, childhood asthma and cot death/SIDS.

Carrying excess weight – Truth

Being overweight is linked with infertility which may be reversible with weight loss in men.

There is still not conclusive evidence that our daily life level of exposure to plastics causes infertility in humans. However animal studies raise cause for concern.

A 2014 study of 5,000 male British cyclists by University College London found no association between cycling and infertility.

Heat bad for sperm – Truth

Testes ‘hang’ outside of the body for a reason, to keep them relatively cool. Prolonged exposure to temperature rise has a negative effect on sperm DNA. Things to avoid include prolonged sitting and hot baths, showers, spas or saunas, and more controversially, tight jocks.

Frequent ejaculation is bad for sperm quality – Myth

Sperm motility suffers when there is infrequent ejaculation. Men tying to conceive should be ejaculating at least two times per week to improve sperm DNA fragmentation.

Foods can make you fertile – Truth

Foods that are naturally high in antioxidants help to create strong sperm DNA. Good dietary antioxidants include vitamins C and E, folate and zinc. This effect is particularly important in men over 40 who have higher baseline rates of sperm DNA damage related to age.


Considering Male Fertility?

Dr Raelia Lew and the Women's Health Melbourne team can talk through what's right for your circumstances.