New research suggests what many fertility specialists have long suspected: what men eat may matter more to conception than commonly appreciated. A recent analysis of Dutch cohort data links higher consumption of ultra-processed foods — think sugary drinks, packaged snacks and processed meats — with a noticeably lower chance of achieving pregnancy.
The study, drawn from the Generation R Next cohort and published in the journal Human Reproduction, tracked reproductive outcomes across hundreds of couples. Investigators found that men who reported greater intake of industrially processed foods faced substantially higher odds of subfertility, while maternal consumption showed different, later effects on early embryo development.
Diet and conception: what the data show
Researchers compared couples’ diets with time-to-pregnancy and early fetal measurements. Men’s eating patterns stood out: as ultra-processed food intake rose, so did the likelihood that couples would experience difficulty conceiving.
- Increased risk: Each step up in consumption of ultra-processed foods was associated with roughly a 36% higher chance of subfertility.
- Highest consumers: Men in the top intake group had meaningfully lower odds of conception than those who ate the least processed items.
- Maternal effects: While mothers’ processed-food intake did not significantly change time-to-pregnancy, embryos at about seven weeks were slightly smaller and had reduced yolk sac volume when maternal consumption was higher.
The embryo differences diminished later in the first trimester, but researchers caution that early developmental windows are sensitive, and small shifts could have implications we do not fully understand.
Diet is not the only determinant of sperm quality — age, smoking, underlying health conditions and environmental exposures all play roles. Still, ultra-processed diets tend to be low in essential nutrients and may increase oxidative stress, a cellular process known to damage sperm. Combined with everyday exposures to plastics and persistent chemicals like PFAS, the result is a cumulative burden that could impair reproductive cells.
Study authors used detailed diet questionnaires and clinical follow-up, but the observational design cannot prove cause and effect. The findings are consistent with a growing body of evidence linking modern dietary patterns to poorer male reproductive metrics, and they underscore a broader public-health question: could population-wide shifts toward highly processed foods be contributing to rising infertility rates in some countries?
For readers trying to weigh the practical significance, consider these takeaways:
- Men matter: This research highlights the father’s diet as an important factor in whether conception occurs.
- Quantity matters: Even moderate increases in processed-food intake were tied to measurable differences; the largest effects appeared among the highest consumers.
- Early pregnancy signal: Maternal processed-food intake showed subtle effects on very early embryo size and yolk sac volume, though those differences lessened later in trimester one.
Policy and clinical practice may need to broaden preconception guidance to include both partners, especially in settings where ultra-processed foods make up a large share of daily calories. Still, the research team and independent experts note that more studies are needed — including interventions — to test whether lowering processed-food intake improves conception rates and early fetal measures.
In short, the study adds to mounting evidence that the modern diet affects more than waistlines. For couples planning pregnancy, it reinforces the value of examining overall eating patterns as one piece of a complex fertility puzzle.
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Miles Harper focuses on optimizing your daily life. He shares practical strategies to improve your time management, well-being, and consumption habits, turning your routine into lasting success.