Fast food and processed foods may reduce chances of conception

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Why you shouldn't eat fast food during pregnancy
20:00, 24.03.2026

Scientists have found a link between eating ultra-processed foods and reduced fertility. In men, such a diet is associated with longer time to conception, while in women it is associated with changes in early embryo development. The study emphasises the importance of nutrition for both parents.



Ultra-processed foods are:

  • fast food
  • ready meals
  • sweet and savoury snacks
  • foods with additives and flavour enhancers

In some countries, they account for up to half of the diet.

Scientists analysed the data:

  • 831 women
  • 651 men

In men

High consumption of such foods was associated with:

  • lower fertility
  • longer time to conception

In women

The association with conception was less pronounced, but observed:

  • slightly slower embryo development
  • smaller yolk sac size at early term

Details

Even small changes early in development can be significant.

Earlier studies have shown that such abnormalities can be associated with:

  • premature birth
  • low birth weight
  • health risks for the baby

Important point

The scientists emphasise:

  • the study shows a link, not a direct cause
  • more data is needed

The results also show that health and nutrition are important not only for women, but also for men.

Why it matters

The study advises:

  • reduce the proportion of ultra-processed foods
  • pay attention to the nutrition of both partners
  • especially when planning a pregnancy

Source

The study was conducted by scientists from Erasmus University Medical Centre (Netherlands).

The results were published in the journal Human Reproduction.

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Elena Rasenko

Elena Rasenko writes about science, healthy living and psychology news, and shares her work-life balance tips and tricks.