Male health is half the fertility equation. Here's what the research says about paternal health.
When couples, and even health care professionals, think about fertility, the focus often lands on female factors — hormones, ovulation, menstrual cycles. But over the past decade, a growing body of medical research has made one thing clear: male health matters — deeply and early.
Fathers contribute much more than just DNA, so including them in preconception care can really optimize the health of their offspring.
Why Male Factors Matter
Today, male factors are implicated in 30-40% of infertility journeys. This can be alterations in sperm count, motility (movement), morphology (shape), DNA integrity etc.
Historically, semen analysis focused on basic numbers. But recent research underscores that quality and function matter too — and that lifestyle and environmental exposures directly influence these metrics.
Some research to consider
- A 2022 review in Human Reproduction Update found that diet quality is strongly correlated with semen parameters, including sperm concentration, motility, and morphology. Diets high in antioxidants, omega-3 fatty acids, and lean proteins were associated with better sperm quality, while Western dietary patterns (high in processed foods and trans fats) were linked to poorer outcomes.
- Men with obesity, insulin resistance, and metabolic syndrome tend to have lower testosterone and poorer semen quality. A 2023 meta-analysis found that increased BMI is associated with declines in sperm count and motility — highlighting that metabolic health directly influences fertility. This connection is likely hormonal (adipose tissue converts testosterone to estrogen) and due to oxidative stress.
- Emerging research shows that men exposed to certain environmental toxicants — like air pollution, pesticides, and endocrine-disrupting chemicals — may have altered sperm DNA integrity and epigenetic marks, which can influence embryonic development and long-term health. These exposures can affect the sperm before conception, with implications that persist into the next generation.
The Importance of Preconception Care for Men
If we are really interested in optimizing the health of the next generation then, preconception care must engage both partners.
Unlike eggs, which are formed before birth, sperm are renewed about every 74 days. That means meaningful improvements can happen quickly when men get serious about their health.
Preconception care isn’t about assigning blame — it’s about shared responsibility and shared opportunity.
References (Recent Medical Research)
- Krausz, C., & Riera-Espinoza, A. (2020). The genetic features of male infertility. International Journal of Molecular Sciences, 21(15), 5386.
- Esteves, S. C., et al. (2021). Semen analysis and male infertility diagnosis. World Journal of Men’s Health, 39(1), 1–20.
- Salas-Huetos, A., et al. (2022). Diet and sperm quality. Human Reproduction Update, 28(5), 725–744.
- Campbell, J., et al. (2021). Obesity, metabolic syndrome, and male fertility. Current Opinion in Endocrinology, Diabetes and Obesity, 28(3), 275–281.
- Sermondade, N., et al. (2023). Body mass index and semen quality: A systematic review and meta-analysis. Journal of Andrology (meta-analytic evidence on BMI and sperm quality).
- Ben Maamar, M., et al. (2020). Paternal environmental exposures and offspring epigenetics. Environmental Epigenetics, 6(1), dvaa012.
- Mário, F. L., et al. (2020). Spermatogenesis: A window of opportunity for intervention. Frontiers in Endocrinology, 11, 600.
