What Does Healthy Sperm Look Like? The Male Fertility Guide Nobody Gives You
Written by Jess Rosenberg, moode Founder | Reviewed June 2026
In 2017, a landmark meta-analysis published in Human Reproduction Update found that sperm counts in men from Western countries had fallen by more than 50% over the preceding 40 years - and that the rate of decline was accelerating. The researchers warned of a potential reproductive crisis if the trend continued without intervention.
This is not a niche concern. Whether you are trying to conceive naturally, via IVF, or using donor sperm, the health of sperm matters significantly to conception outcomes. And yet male fertility evaluation is still not performed in at least 18% of couples seeking fertility investigation - meaning male factor infertility goes undetected and unaddressed in a meaningful proportion of couples who are struggling to conceive.
The good news is that sperm health is responsive to change. Unlike eggs, which are largely determined by genetics and age, sperm is produced continuously - a full cycle of sperm production takes approximately 72 days. What a man eats, how he sleeps, what he is exposed to, and how he manages stress can all measurably influence the sperm available in the next cycle. This is one of the most actionable areas in reproductive health.
What does healthy sperm actually mean?
Sperm health is assessed across four main parameters:
Count
The total number of sperm in a semen sample. A normal count is generally considered 15 million sperm per millilitre or above.
Motility
The percentage of sperm that are moving, and moving well. At least 40% of sperm should be moving, with 32% showing progressive forward movement. Motility matters because sperm must travel a significant distance to reach and fertilise an egg.
Morphology
The shape and structure of sperm. A normal sperm has an oval head and a long tail. Abnormally shaped sperm are less able to penetrate an egg. The threshold for normal morphology is at least 4% of sperm by the WHO's criteria - a number that surprises many people given how low it sounds.
Volume
The total amount of semen produced per ejaculation. Normal semen volume is between 1.5 and 5 millilitres. Very low volume can indicate ductal obstruction or hormonal issues.
A semen analysis assesses all four parameters simultaneously. If you have been trying to conceive for six months or more without success, a semen analysis for your partner is one of the most efficient and low-cost investigations available - and should be done alongside, not after, the female workup.
What affects sperm health?
Sperm health is a direct reflection of overall health. The factors that compromise it fall into two categories: environmental and lifestyle.
Environmental factors
Endocrine-disrupting chemicals - compounds that interfere with hormonal signalling - have been identified as a significant contributor to declining sperm counts at a population level. The most relevant exposures are:
Parabens
Found in many personal care products including shampoos, moisturisers and deodorants. Switching to paraben-free products is a simple and immediate change.
Pesticides
Both through dietary exposure and occupational contact. Washing produce thoroughly and reducing consumption of non-organic produce where possible reduces dietary pesticide load.
Air pollutants and industrial chemicals
Particularly relevant for men who work in manufacturing, agriculture or construction. Adequate protective equipment and ventilation matter.
Heat exposure to the testes
Laptops on laps, hot baths, tight underwear and prolonged sitting all raise scrotal temperature above the level at which sperm develop optimally. The testes are located outside the body precisely because sperm require a slightly lower temperature than core body temperature. This is an easy and often overlooked factor to address.
Lifestyle factors
Smoking - both tobacco and cannabis - directly reduces sperm count, motility and morphology. The damage is reversible with cessation, but it takes a full sperm cycle (approximately 72 days) to see measurable improvement.
Alcohol
At levels above moderate consumption (more than five standard drinks per week) has been associated with reduced testosterone, impaired sperm morphology and reduced motility.
Psychological stress
Drives cortisol production, which suppresses testosterone and disrupts the hormonal cascade that regulates sperm production. Chronic stress is one of the more underappreciated factors in male fertility.
Obesity
Particularly central adiposity, is associated with hormonal dysregulation, elevated oestrogen relative to testosterone, and impaired sperm parameters. The relationship is dose-dependent: the higher the BMI, the more pronounced the effect.
Illicit drugs
Including anabolic steroids. Exogenous testosterone from steroids can suppress the body's own testosterone production and effectively halt sperm production entirely. Recovery after steroid cessation can take months to years.
What should a male preconception diet look like?
The Mediterranean diet has the strongest evidence base for male fertility of any dietary pattern. Its antioxidant and anti-inflammatory profile directly addresses oxidative stress, one of the primary mechanisms by which sperm DNA is damaged.
Research has found that men following a Mediterranean-style diet have measurably better sperm quality than those following a typical Western diet.
Prioritise:
Oily fish
Salmon, sardines, mackerel - two to three times a week for omega-3 fatty acids, which are directly incorporated into sperm membranes and affect motility and morphology.
Nuts and seeds
Particularly walnuts and pumpkin seeds, for zinc and antioxidants. Zinc is one of the most critical nutrients for sperm production and testosterone synthesis.
Fresh fruits and vegetables
In variety and volume, like berries, tomatoes, leafy greens, for antioxidants that reduce oxidative stress on sperm DNA.
Eggs for choline, zinc and protein. Whole grains for fibre and B vitamins. Olive oil as the primary fat.
Reduce:
Processed red meat, fatty dairy, alcohol, sugary drinks and ultra-processed foods. These foods are associated with increased oxidative stress and poorer sperm morphology and motility.
Supplementation for male preconception health
Three supplements have the strongest evidence base for male preconception nutrition:
Zinc: directly involved in testosterone production and sperm development. Deficiency is associated with significantly reduced sperm count and motility.
CoQ10: supports mitochondrial function in sperm, which drives motility. Particularly relevant for men over 35 or those with documented motility issues. Typical therapeutic doses in research are 200-400mg daily.
Antioxidants: vitamins C and E, selenium, and lycopene (found in cooked tomatoes) all reduce oxidative stress on sperm DNA. Many men's preconception supplements combine these.
The Australian Family Physician Journal recommends that male fertility evaluation occur alongside female fertility evaluations - not after, as a fallback. If you are trying to conceive and have not yet done a semen analysis, it is worth requesting one through your GP now rather than waiting.
moode answers your questions about sperm health
How long does it take to improve sperm health?
A full cycle of sperm production takes approximately 72 days. Dietary and lifestyle changes made today will begin to show measurable improvement in semen analysis results in approximately three months. This is why male preconception preparation should begin at least three months before trying to conceive - for the same reason it is recommended for women.
What is the most important thing a man can do to improve sperm health?
Stop smoking if applicable - this has the single largest measurable impact. Beyond that, the Mediterranean diet, moderate alcohol intake, reducing heat exposure to the testes, managing stress and getting a baseline semen analysis are all high-value interventions.
Does a man's age affect sperm quality?
Yes, though less dramatically than maternal age affects egg quality. Sperm DNA fragmentation increases with age, and paternal age has been associated with slightly increased risk of certain conditions in offspring. The effect becomes more relevant from around age 40.
Can a varicocele affect fertility?
Yes. A varicocele - an enlargement of the veins within the scrotum - is one of the most common and correctable causes of male factor infertility, found in approximately 15% of men and 35% of those with primary infertility. It raises scrotal temperature and increases oxidative stress. Surgical correction can significantly improve sperm parameters. It is diagnosed by physical examination and ultrasound.
When should we get a semen analysis?
If you have been trying to conceive for six months without success, a semen analysis is appropriate to request from your GP. If there is a known male factor concern - previous testicular injury, history of STIs, undescended testicle, or known exposure to gonadotoxic treatments - it is worth requesting before you start trying.
About the author
Jess Rosenberg is the founder of moode and a trained nutritionist and naturopath. She created The Prenatal after her own experience of pregnancy left her questioning the quality of what was available on the Australian market. Learn more about moode.
