Ultra-Processed Foods Linked to Reduced Fertility and Impaired Embryonic Development

New research indicates that the consumption of large quantities of ultra-processed foods (UPF) is linked to reduced fertility in men and impaired embryonic development in early pregnancy.

According to a study published in Human Reproduction on March 24, 2026, the impact of these dietary habits extends to both partners during the periconceptional period, affecting the growth and viability of early embryos.

Impact on Embryonic Development and Fertility

The findings highlight a specific association between high maternal intake of ultra-processed foods and negative outcomes in early embryonic growth. Specifically, women with higher UPF consumption showed smaller embryonic growth and smaller yolk sac volumes.

Yolk sacs are described as essential components for early embryonic development, making their reduced volume a significant finding in the study of periconceptional health.

The research also identified a link between higher paternal consumption of ultra-processed foods and reduced fertility in men.

Significance of the Research

This study is noted as the first to examine the combined impact of ultra-processed food diets in both men and women simultaneously regarding fertility and embryonic development.

By analyzing the periconceptional period—the time immediately before and after conception—the research suggests that dietary choices made by both parents before conception may shape the growth of the embryo and the overall success of fertility.

Context of Ultra-Processed Foods

Ultra-processed foods are typically industrial formulations made primarily or entirely from substances derived from foods, often containing additives, preservatives, and artificial flavorings.

The association between these foods and reproductive health suggests that the nutritional quality of the diet during the window of conception plays a critical role in early biological development.

The observed slower growth in early embryos linked to UPF consumption emphasizes the potential risks associated with diets high in processed ingredients during the earliest stages of pregnancy.