Improving & Future-Proofing Male Fertility
Practical, evidence-based steps you can take — and when to seek specialist help
Sperm counts have been declining over recent decades, and lifestyle plays a real part in male fertility. Many of the most effective steps are things you can start today. Because sperm take about three months to develop, give changes time to work.
Lifestyle
Steps that can make a difference
Reach a healthy weight
Obesity is linked to lower testosterone and poorer sperm quality. Even moderate weight loss can improve hormone levels and semen parameters.
Stop smoking and vaping
Smoking lowers sperm count, movement and quality, with a dose-related effect. The good news is that the harm is largely reversible — aim to stop for at least three months. Vaping is not a safe alternative.
Keep alcohol moderate
Heavy drinking harms sperm in a dose-dependent way. Keeping within sensible limits is best while you are trying to conceive.
Avoid recreational drugs
Cannabis lowers testosterone and affects sperm production. Anabolic steroids shut down the body’s own sperm production — sometimes for years — and should be avoided entirely.
Eat a Mediterranean-style diet
A diet rich in fish, fruit, vegetables, legumes, wholegrains and olive oil — and low in saturated fat, red meat and sugary drinks — is associated with better sperm quality in some studies.
Keep the testicles cool
Sperm production prefers a temperature a few degrees below body heat. Avoid saunas, steam rooms, hot tubs and very hot baths, and treat any cause of raised scrotal temperature.
Exercise — in moderation
Regular, moderate physical activity supports fertility. Very intense endurance training (and a lot of cycling) may have the opposite effect, so balance is best.
Manage stress
Significant or prolonged stress can affect semen quality. Looking after your mental wellbeing is part of looking after your fertility.
A note on supplements
Antioxidant and "male fertility" supplements are popular, and some evidence suggests they may modestly improve outcomes. However, the highest-quality reviews remain inconclusive because the trials behind them are small and of variable quality. They are generally safe and inexpensive, but they are not a substitute for addressing lifestyle factors and any treatable underlying cause.
Protecting your future fertility
If you are about to have chemotherapy or radiotherapy, it is very important to bank (freeze) sperm beforehand. If your work or hobbies expose you to heat or certain chemicals, simple changes can help. And if you are concerned about your fertility, it is always better to seek help early — particularly bearing in mind your partner's age.
When to see a specialist
See a specialist if you and your partner have been trying for a year without success (or sooner if your partner is over 35), if a semen test is abnormal, or if you have noticed a lump or swelling in the testicle. An assessment can identify a treatable cause — such as a varicocele — and, importantly, can occasionally detect conditions like a testicular tumour that need attention.
Frequently asked questions
How long does it take for lifestyle changes to improve sperm?
Sperm take around three months to develop, so most positive changes — stopping smoking, losing weight, recovering from a fever or illness — take about three months to show in a semen test. Patience and consistency are key.
Do antioxidant or fertility supplements actually work?
The honest answer is that the evidence is mixed. Some studies suggest a modest benefit, but the best-quality reviews are inconclusive because of weaknesses in the underlying trials. Supplements are inexpensive and generally safe, but they are not a guaranteed fix and should not replace addressing lifestyle and any treatable cause.
Should I bank sperm before cancer treatment?
Yes. It is very important to bank (freeze) sperm before chemotherapy or radiotherapy, as these treatments can affect fertility. Please arrange this before treatment starts wherever possible.
Is a varicocele worth treating?
Sometimes. A varicocele (enlarged veins around the testicle) can affect sperm quality. Repair can improve sperm count and motility in selected men; whether it helps your chance of pregnancy depends on your individual situation, which Mr Wiseman can assess.
Can testosterone or anabolic steroids cause infertility?
Yes, and this is often missed. Taking testosterone or anabolic steroids switches off the body’s own signal to make sperm and can cause the sperm count to fall to zero. Production usually recovers after stopping, but this can take many months, so it is important to tell Mr Wiseman if you use them.
Do heat and tight clothing affect sperm?
The testicles work best a little cooler than the rest of the body, so frequent hot baths or saunas, prolonged laptop use on the lap and very tight underwear may have a modest effect on sperm quality. Keeping cool is a simple, sensible measure while you are trying to conceive.
How do smoking, alcohol and recreational drugs affect fertility?
Smoking, heavy drinking and drugs such as cannabis are all linked with poorer sperm quality. Cutting them out is one of the most effective changes you can make, and the benefit usually shows within about three months as new sperm develop.
Does age affect male fertility?
Men remain fertile far later in life than women, but sperm quality and DNA integrity do decline gradually with age, which can affect the chance of conception and slightly increase certain risks. It is one of several factors Mr Wiseman weighs up when advising a couple.
Discuss your fertility with a specialist
Book a private consultation with Mr Oliver Wiseman, or arrange an NHS referral through your GP. Face-to-face, telephone and video appointments are available.