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Research has reported a long-term decline in average sperm counts in many parts of the world. This can feel worrying, but it should not be framed as a reason for panic or blame. Sperm health is influenced by many factors, including environment, lifestyle, age, medical history and overall health.
Understanding these factors can help men and couples make more informed decisions about testing, preconception preparation and when to seek professional support. This page explains what the research says, what may be contributing to the trend, and practical steps men can review as part of a wider fertility plan.
Research suggests that average sperm counts have declined over recent decades, although the reasons are likely to be complex. Possible contributing factors include environmental exposures, lifestyle patterns, obesity, smoking, alcohol, poor sleep, stress, age, heat exposure and some medical factors. For individual men, the most useful next step is not panic, but reviewing modifiable factors and considering semen analysis or professional advice where appropriate.
Large-scale analyses have reported a decline in average sperm concentration over recent decades. One widely cited meta-analysis reported that average sperm concentration fell from around 104 million per millilitre in 1973 to around 49 million per millilitre in 2018, with the rate of decline appearing to accelerate after 2000.1
These findings describe population-level trends. They do not mean every individual man has poor sperm quality, and they do not replace individual testing such as semen analysis.
The reasons behind the population-level decline are likely to be complex and are still being researched. A number of environmental, lifestyle, age-related and medical factors are commonly discussed in relation to sperm quality.
Phthalates, bisphenol A (BPA) and other chemicals found in some plastics, cosmetics and household products are often described as endocrine-disrupting chemicals. These substances are commonly discussed in relation to hormonal pathways and reproductive health, although individual exposure and risk varies, and research in this area continues to develop.2
Some studies have reported associations between higher air pollution exposure and lower sperm concentration, total sperm number and motility, although findings vary between studies and this should not be described as proven or definitive.3 Chronic exposure to noise pollution has also been discussed as a possible factor in reproductive health, though the evidence here is less developed.
Sedentary routines, ultra-processed diets, low nutrient intake, obesity, poor sleep, long-term stress, smoking and alcohol are among the lifestyle factors commonly discussed in relation to sperm quality. Age is also relevant, with some research suggesting sperm quality may change as men get older, particularly after 40.
Saunas, hot baths, laptops used on the lap, tight clothing and occupational heat exposure are commonly discussed in relation to sperm production, since the testes are sensitive to raised temperature.4
Sperm DNA fragmentation, varicocele, infections, hormonal issues, certain medications and chronic health conditions may also play a role for some men. Where any of these are a concern, male fertility tests such as semen analysis can help build a clearer picture alongside a GP or fertility clinic.
Sperm development takes place over roughly 72 to 90 days when production, maturation and transport are considered.5 This is why many preconception plans focus on the three months before trying to conceive or starting fertility treatment. It gives time to review diet, alcohol, smoking, sleep, stress, heat exposure, medical factors and, where appropriate, supplementation.
For a deeper explanation of sperm count, motility, morphology, DNA fragmentation and the sperm development window, watch our Sperm Health Masterclass.
Although wider environmental and population-level factors require broader action, individual men can still review practical areas that may support reproductive health.
A diet that includes colourful fruit and vegetables, quality protein, whole grains, healthy fats, omega-3 sources and zinc and selenium-rich foods is commonly discussed in relation to reproductive wellbeing.
Smoking and alcohol are commonly discussed in relation to sperm count, motility and reproductive health. If you smoke, seeking support to stop may be one of the most useful health steps to consider.
Regular movement may support overall metabolic health, weight management and wellbeing.
Where practical, some men choose to review habits such as frequent saunas or hot baths, laptops used directly on the lap, tight clothing and occupational heat exposure.
Sleep and stress may influence hormone balance, energy and wider wellbeing.
Where practical, men may choose to reduce exposure to plastics, BPA, pesticides and heavily fragranced products, while recognising that not all exposures are fully within individual control.
If you have concerns, semen analysis can provide useful information about sperm count, motility and morphology. A GP, fertility clinic or healthcare professional can help interpret results and advise on next steps. Read more about male fertility tests.
Supplements may be considered as part of a wider preconception plan, particularly where diet, lifestyle, semen analysis results, age, nutritional intake or professional guidance suggest they may be relevant.
They should not replace semen analysis, medical advice, lifestyle foundations or investigation of possible underlying factors. If you are unsure what is appropriate, speak to a GP, fertility clinic or healthcare professional.
Some men choose to review the following nutrients and products as part of their wider fertility plan:
For a practical guide to choosing and combining products, read our male fertility supplement guide.
Fertility is often discussed mainly in relation to women, but male factors can contribute to fertility challenges. Talking openly about male fertility can help couples seek testing earlier, understand their options and feel better supported.
This is not about blame. It is about making sure both partners have access to the right information and support. For a broader introduction to male fertility and sperm health, see Male Fertility Matters.
The reasons are likely to be complex and are still being researched. Possible contributing factors include environmental exposures, lifestyle patterns, age and some medical factors, alongside the population-level trends reported in large-scale analyses.
No. Population-level trends do not diagnose individual men. Semen analysis is needed for an individual assessment of sperm count, motility and morphology.
Lifestyle factors such as smoking, alcohol, sleep, stress and heat exposure are commonly discussed in relation to sperm quality, alongside age, medical factors and environmental exposures such as endocrine-disrupting chemicals and air pollution.
Diet, movement, sleep, stress management, smoking cessation, alcohol reduction and reviewing heat exposure are commonly discussed in relation to sperm health, although individual responses vary.
Sperm development takes place over roughly 72 to 90 days, so many men allow around three months to review diet, lifestyle and other factors before expecting any change to be reflected in a semen analysis. Individual responses vary.
Semen analysis is often considered after 12 months of trying to conceive, or after 6 months if the female partner is over 35. It may be worth considering sooner if there are known concerns, planned IVF or ICSI, previous fertility issues or relevant medical history.6
Supplements may support nutritional status as part of a wider plan, but they should not replace semen analysis, testing or medical advice. Individual circumstances vary.
Age may be associated with changes in sperm DNA fragmentation and other aspects of reproductive health, particularly after 40, although individual circumstances vary.
If you want to understand male fertility and sperm health in more detail, these resources are a helpful next step.
Inside Vitafem: Continuing our heritage of evolving with the latest clinical evidence to set a new standard for female fertility formulas.
