# Maternal Overnutrition and Fetal Programming: Long-Term Metabolic, Cognitive, and Epigenetic Consequences

## TL;DR

This paper reviews how poor maternal nutrition during pregnancy can lead to long-term health issues in offspring, including obesity, metabolic disorders, and cognitive problems.

## Contribution

The paper highlights the role of maternal overnutrition and gestational diabetes in fetal programming and discusses epigenetic and metabolic mechanisms.

## Key findings

- Maternal overnutrition alters fetal metabolic pathways and increases susceptibility to metabolic syndrome.
- Maternal obesity is linked to cognitive dysfunction and elevated cancer-related mortality in offspring.
- Epigenetic changes from maternal overnutrition may be transgenerational, and paternal obesity also affects fetal programming.

## Abstract

Maternal nutrition during pregnancy critically influences fetal programming, shaping the offspring’s lifelong health and disease susceptibility. Both undernutrition and overnutrition affect fetal metabolism, predisposing offspring to obesity and cardiometabolic disorders in adulthood. This review examines current evidence on how maternal nutrition, particularly overnutrition and its complications, such as gestational diabetes mellitus (GDM) and obesity, affects offspring health. It also explores the biochemical and epigenetic mechanisms underlying aberrant fetal programming induced by an unfavorable intrauterine environment. Excess nutrient exposure in utero alters fetal metabolic pathways by modifying the expression of key metabolic genes and nutrient sensors, increasing susceptibility to metabolic syndrome later in life. Maternal obesity has additionally been linked to cognitive dysfunction, immune alterations, and elevated cancer-related mortality in the offspring. GDM exposure disrupts fetal hypothalamic development, impairing appetite regulation. Emerging evidence suggests that epigenetic changes induced by maternal overnutrition may be transmitted across generations and that paternal obesity may also contribute to fetal metabolic programming. Although lifestyle interventions during pregnancy have been tested, they show limited long-term benefits, whereas pre-pregnancy BMI remains the strongest predictor of offspring obesity, emphasizing the critical role of preconception care and the prevention of overweight in women of reproductive age.