When you’re expecting, every bite matters. What you eat fuels your body and helps shape the tiny, developing brain inside you. But what if some of the most common foods on your plate could be quietly increasing the risk of neurodevelopmental conditions like ADHD in your child?

A groundbreaking study published in Nature Metabolism (Horner et al., 2025) is now drawing attention to the link between a typical Western diet during pregnancy and an increased risk of attention-deficit hyperactivity disorder (ADHD) in children. It’s a wake-up call—and an opportunity—to rethink how we nourish our future generation.

What is the Western diet, and why is it a problem?

The Western diet is everywhere. Burgers, fries, sugar-loaded drinks, processed snacks, and pastries—convenient, tasty, and often addictive. But this dietary pattern is notoriously high in saturated fats, sugars, and refined carbs while being low in fiber, vitamins, and essential nutrients.

While its connection to obesity, heart disease, and diabetes is well-documented, this new research suggests that the effects go far deeper, into the neurological development of children whose mothers consumed these foods during pregnancy.

The science behind the link

Researchers analyzed dietary data from over 500 pregnant women and followed their children until age 10. They found a clear association: moms who stuck closely to a Western-style diet during early to mid-pregnancy were more likely to have children diagnosed with ADHD or traits associated with autism.

To validate the findings, the researchers extended their analysis to three additional large-scale international cohorts, over 60,000 mother-child pairs. Across the board, the data told the same story: the Western diet during pregnancy is consistently linked to an increased risk of ADHD in children (Horner et al., 2025).

But the researchers didn’t stop there.

Using advanced metabolomics (a way to study molecules in the blood), they discovered that mothers with a Western diet had altered levels of 15 key metabolites. These molecules, which influence inflammation and oxidative stress, may be interfering with fetal brain development.

The role of nutritional epigenetics

This research ties into a broader field called nutritional epigenetics—the study of how food can change gene expression without changing DNA itself. During pregnancy, the baby’s brain and nervous system are incredibly sensitive to the environment, and nutrition is a major player.

For example, inadequate intake of folate or choline has been shown to impact DNA methylation, a process that turns genes on or off. Disruptions in this process can affect the formation of neural circuits and behavior later in life (Bhat et al., 2021).

It’s not just ADHD: emotional and behavioral impacts

Other recent research in Scientific Reports has found that a high-glycemic diet (foods that cause rapid spikes in blood sugar) in the third trimester is linked to greater negative affect in infants, meaning babies may become fussier, more irritable, or less emotionally regulated (Carver et al., 2025).

Furthermore, studies have shown that maternal obesity itself—often a result of long-term Western eating habits—also increases the likelihood of ADHD symptoms in children (Chen et al., 2021).

What should expecting moms eat instead?

The good news? Food choices are one of the few modifiable risk factors during pregnancy. Small changes can have lasting benefits.

Here are a few evidence-backed tips:

  • Prioritize whole foods: opt for colorful fruits, vegetables, legumes, whole grains, nuts, and seeds.

  • Incorporate healthy fats: choose omega-3-rich sources like flaxseeds, chia seeds, walnuts, and fatty fish (if not contraindicated).

  • Cut back on processed foods: reduce intake of packaged snacks, sugary drinks, and fast food.

  • Balance blood sugar: focus on low-glycemic-index foods like oats, sweet potatoes, and lentils.

  • Talk to your healthcare team: get personalized nutritional guidance to ensure you're meeting your and your baby’s needs.

The bottom line

This isn’t about guilt or perfection—it’s about awareness. The research is clear: what you eat during pregnancy can shape your child’s brain development in ways we’re only beginning to understand.

With every nutritious meal, you're not just feeding yourself; you're building the foundation for your baby’s mental, emotional, and cognitive future.

So next time you reach for that ultra-processed snack, pause and ask yourself, is there a more nourishing option for both of you?

Extending awareness

This research serves as a critical reminder that pregnancy is a time of profound developmental changes for your baby. The decisions you make around food can have a lasting impact on their health and well-being. While we cannot control all factors, including genetics, the environment, or external stressors, we can certainly influence the early stages of brain development through mindful nutrition.

It's also important to remember that while diet plays a significant role, other lifestyle factors—such as managing stress, staying active, and getting adequate rest—also contribute to a healthy pregnancy. So, making small, positive adjustments to your diet and lifestyle can create a nurturing environment that supports your child's cognitive and emotional growth in the years to come.

By making informed choices, you’re taking an active role in shaping your child’s future.

References

Horner, K. M., Ejsing, M. A., Rajkumar, R. P., Wu, R., Chawes, B. L. K., Thorsen, J., Stokholm, J., Bønnelykke, K., & Bisgaard, H. (2025). Western diet during pregnancy is associated with offspring attention-deficit hyperactivity disorder. Nature Metabolism.
Carver, A., Villagomez, W. S., Sadler, J. R., Leckie, R. L., & Kable, J. W. (2025). Prenatal dietary glycemic index predicts infant negative affect. Scientific Reports, 15, 5591.
Chen, L., Yu, Y., Zhang, H., Zhou, R., & Gao, W. (2021). [Maternal pre-pregnancy obesity and the risk of ADHD symptoms in offspring: Evidence from a meta-analysis](https://www.nature.com/articles/s41398-021-01584-. Translational Psychiatry, 11, 492.
Bhat, S. A., Ahmad, S. M., & Mushtaq, S. (2021). Nutritional epigenetics: A window on human health. Nutrition Research Reviews, 34(1), 1–20.