Lifestyle Habits That Affect Sperm Quality: The Evidence
Lifestyle Habits That Affect Sperm Quality: What the Evidence Says
Some everyday habits can affect sperm quality, but the evidence is stronger for some than for others. Drug use, heavy drinking and excess weight have the clearest links, while the effect of tight underwear or laptops is far less certain. This guide separates what is well supported from what is not, so you can focus on changes that matter.
This article is general information and does not replace personal medical advice.
Habits with the clearest links to lower sperm quality
These are the habits that UK health guidance most often advises men to change when trying for a baby:
Anabolic steroids. Long-term misuse can reduce sperm count and movement. Read our guide on what anabolic steroids do to male fertility.
Cannabis and cocaine. Both are linked to lower semen quality, so avoiding them is advised when trying for a baby.
Heavy drinking. Excessive alcohol can affect sperm quality. The UK guideline is to drink no more than 14 units a week, spread over three or more days.
Smoking. Smoking can affect sperm quality, and quitting is advised. Your GP can refer you to NHS stop smoking support.
If you use testosterone, tell your doctor before you try to conceive, because it can switch off sperm production. See testosterone replacement therapy and fertility.
Weight, diet and heat
Weight. Men with a BMI of 30 or more are likely to have reduced fertility, and a healthy BMI is generally 20 to 25. A balanced diet and regular exercise help you reach and keep a healthy weight. Our guides explain how obesity affects testosterone and the impact of ultra-processed foods.
Heat. The testicles work best slightly below body temperature, and higher scrotal temperature can reduce semen quality. If your job involves heat or long periods of sitting, take regular breaks and move around.
Work exposures. Some jobs involve substances such as pesticides or radiation that may affect fertility. If this applies to you, talk to your GP or occupational health team.
Habits with weaker evidence
Tight underwear. Tight underwear is thought to raise testicle temperature, but research has not shown that it affects sperm quality. Choosing looser styles such as boxers while you are trying to conceive is harmless, but do not expect it to fix a problem.
Supplements. Many products claim to boost sperm count. Evidence for them is mixed, and some products contain ingredients that can do harm. Ask your doctor before you start any supplement, and avoid herbal remedies unless a doctor approves them, as some can affect sperm production.
A practical checklist
Stop smoking, and get help if you need it.
Keep alcohol within 14 units a week, spread over three or more days.
Avoid cannabis, cocaine and anabolic steroids.
Tell your doctor about any testosterone or other medicines you take.
Aim for a BMI in the healthy range through diet and exercise.
Take breaks from heat and long periods of sitting.
Give changes about three months to show in a repeat semen analysis, because sperm take around that long to develop.
When lifestyle is not enough
Lifestyle changes are worth making, but they do not fix every cause of low sperm count. Medical causes such as a varicocele, hormone problems, infections or genetic conditions need a proper assessment.
See a specialist if you have been trying for a year, you have had an abnormal semen analysis, or you have a history of testicular problems. Read when to see a male fertility specialist and what to expect at your first appointment.
Frequently asked questions
How long do lifestyle changes take to improve sperm quality?
Sperm take about three months to develop, so allow around that long before repeating a semen analysis.
Does alcohol affect sperm?
Heavy drinking can. Staying within the UK guideline of 14 units a week is advised.
Do tight boxers or briefs cause infertility?
Research has not shown that tight underwear affects sperm quality, though looser styles are harmless to try.
Can I improve my sperm count with supplements? Evidence is mixed. Speak to a doctor before taking any, and have your sperm tested first.
Can steroids or testosterone cause infertility? Yes. They can reduce or stop sperm production, so tell your doctor if you use them.
Book a male fertility consultation
If you want personal advice on your sperm health, book a consultation online with The Male Factor Fertility Clinics London, Barnby St, London NW1 1AA.
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