Der Verzehr großer Mengen hochverarbeiteter Lebensmittel (UPF) ist nicht nur mit einer verminderten Fruchtbarkeit bei Männern verbunden, sondern auch mit einem langsameren Wachstum früher Embryonen und kleineren Dottersäcken, die für die frühe Embryonalentwicklung unerlässlich sind

>“In men, we observed that higher UPF consumption was related to a higher risk of subfertility and a longer duration until pregnancy was achieved, but not with early embryo development. This association may be explained by the sensitivity of sperm to dietary composition, whereas maternal UPF consumption may directly influence the environment in the womb in which the embryo develops from the start of life onwards.”
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>Dr Gaillard said: “Our findings suggest that a diet low in UPFs would be best for both partners, not only for their own health, but also for their chances of pregnancy and the health of their unborn child.”

[Periconceptional ultra-processed food consumption in women and men, fertility, and early embryonic development – PubMed](https://pubmed.ncbi.nlm.nih.gov/41871947/)