Ultra‑processed foods linked to fertility
A new study reported that high intake of ultra‑processed foods is associated with reduced fertility in men, slower growth in early embryos and smaller yolk sacs — measures tied to early development. (medicaldialogues.in) The coverage frames UPF risk beyond weight‑related outcomes and into reproductive health signals. (medicaldialogues.in)
Ultra-processed foods are industrial formulations built for convenience, and a new March 24, 2026 study linked higher intake to lower male fertility and slower early embryo growth. (academic.oup.com) Researchers published the paper in *Human Reproduction* after analyzing 831 women and 651 male partners in the Generation R Next cohort in Rotterdam, the Netherlands. Couples entered the study before conception or during pregnancy between 2017 and 2021. (academic.oup.com) (focusonreproduction.eu) The team classified foods with the NOVA system, which groups foods by how heavily industry alters them rather than by calories alone. Median ultra-processed food intake was 22.0% of total food intake for women and 25.1% for men. (openknowledge.fao.org) (academic.oup.com) For men, higher ultra-processed food intake was tied to lower fecundability, meaning lower odds of conception within one month, and higher subfertility, defined here as trying for at least 12 months or using assisted reproductive technology. The study estimated a fecundability ratio of 0.90 and an odds ratio for subfertility of 1.36 for each standard-deviation increase in paternal intake. (academic.oup.com) For women, the study did not find a clear link between ultra-processed food intake and fertility outcomes. It did find smaller crown-rump length, a standard ultrasound measure of embryo size, and smaller yolk sac volume at 7 weeks of gestation with higher maternal intake. (academic.oup.com) Those embryo findings weakened at 9 and 11 weeks, which means the strongest signal appeared in the earliest scans. The yolk sac is the embryo’s first support structure, supplying nutrients before the placenta takes over. (academic.oup.com) (medicalxpress.com) The study was observational, not a randomized trial, so it cannot prove that ultra-processed foods caused the fertility or embryo changes. The authors said they adjusted for socio-demographic and lifestyle factors, but residual confounding remains possible. (academic.oup.com) The paper also stands out because it measured both parents around conception instead of looking only at maternal diet after pregnancy began. The Generation R program describes itself as a population-based cohort that tracks parents and children from early life onward. (focusonreproduction.eu) (erasmusmc.nl) Ultra-processed foods already account for up to 50% to 60% of daily intake in some high-income countries, according to the European Society of Human Reproduction and Embryology press release on the study. The new paper adds reproductive health measures to a literature that has more often focused on obesity, diabetes, heart disease and cancer. (focusonreproduction.eu) (nutrition.org.uk) The authors said the findings support cutting back on ultra-processed foods around conception and in early pregnancy, but they also called for more research to confirm the links. For now, the paper points to the months before and just after conception as another window when diet may shape what happens next. (focusonreproduction.eu)
