Prenatal High Fructose Exposure Linked to Impaired Brain Development and Memory: Study - Video

Could too much sugar during pregnancy affect a child's brain for life? A new animal study suggests that high fructose intake during pregnancy may leave lasting biological changes in the developing brain, potentially impairing learning and memory long after birth.

Researchers from Fujita Health University School of Medicine in Japan investigated the effects of prenatal exposure to high-fructose corn syrup in rats. Pregnant rats were fed a diet rich in fructose, and their offspring were later assessed for brain development, learning, and memory.

The findings, published in Stem Cell Reports, showed that adult offspring exposed to high fructose before birth performed worse on learning and memory tests than those whose mothers consumed a normal diet.

The researchers found that neurogenesis—the process by which new neurons are formed from neural stem cells—was significantly reduced in brain regions involved in learning and cognition. Neural stem cells from fructose-exposed offspring also showed reduced cell division, impaired ability to generate new neurons, and altered patterns of gene activity.

Further investigation revealed that prenatal fructose exposure caused long-lasting epigenetic changes, which are chemical modifications that regulate how genes are switched on or off without altering the DNA sequence itself.

Importantly, restoring the normal activity of some of these genes improved the function of the affected neural stem cells, suggesting that at least some of the harmful effects may be reversible.

The researchers believe the findings provide evidence that maternal nutrition can leave a lasting biological "memory" in developing brain cells. While previous human studies have linked high fructose intake during pregnancy with increased risks of metabolic and neurological disorders in children, this study offers insight into the possible cellular mechanisms involved.

REFERENCE: Kageyama, I., et al. (2026) Neural stem cells as potential mediators of prenatal dietary stress through epigenetic mechanisms. Stem Cell Reports. DOI: 10.1016/j.stemcr.2026.102996. https://www.cell.com/stem-cell-reports/fulltext/S2213-6711(26)00207-9