Overview
- The Human Reproduction paper, highlighted Thursday by multiple outlets, analyzed hundreds of Dutch couples and found sex-specific links between ultra-processed food intake and reproductive measures.
- In men, higher intake was associated with reduced fecundability and greater subfertility risk across the full range of consumption, with one analysis estimating about a 10% lower chance to conceive per standard-deviation increase.
- In women, higher intake did not clearly change time to pregnancy, though embryos measured around seven weeks showed slightly shorter crown–rump length and smaller yolk sac volume, with effects fading later in the first trimester.
- Researchers used food-frequency questionnaires completed at a median of 12 weeks’ gestation and early transvaginal ultrasounds at 7, 9, and 11 weeks, and reported median ultra-processed food shares of diet at 22% for women and 25% for men.
- The authors caution that the observational design, self-reported diet, inclusion of only couples who conceived, and some inconsistencies across analytic approaches limit causal claims, even as media reports cited larger and differing percentage figures from this and related studies.