According to Gram Research analysis, folic acid fortification of foods changed which genetic variants increase heart defect risk in newborns. A 2026 study of 1,285 children found that genetic variants previously linked to heart defects became significantly less common after folic acid fortification began, with some variants appearing 2-4 times more frequently in children born before fortification. This suggests that adequate maternal folate intake may reduce the impact of certain genetic risk factors for heart defects.
When the U.S. started adding folic acid to bread and grain products in the 1990s, it reduced birth defects dramatically. Now, researchers wanted to understand how this change affected the genes linked to heart defects in babies. Using genetic data from over 1,200 children, scientists compared those born before and after fortification began. They discovered that certain genetic variants became less common after folic acid fortification started, suggesting that better nutrition may have actually changed which genetic risk factors matter most for heart defects. This research shows how a simple public health decision can interact with our genes in unexpected ways.
Key Statistics
A 2026 genetic study of 1,285 children found that two variants in the DHRS3 gene were approximately twice as common in children born before folic acid fortification (odds ratio 2.10-2.21), suggesting better folate nutrition reduced their impact on heart defect risk.
Four genetic variants in the PPARGC1β gene showed even stronger patterns in children with conotruncal heart defects, appearing 4.5 times more frequently in the pre-fortification group, indicating substantial gene-nutrient interactions.
Among all 1,285 children studied, eight genetic locations showed enrichment before fortification, with affected genes controlling cardiac developmental pathways, demonstrating that folic acid fortification may have shifted genetic risk profiles for heart defects.
The research identified that genetic variants associated with heart defects were significantly more common in children born before 1998 compared to those born after 2000, when folic acid fortification became widespread in the United States.
The Quick Take
- What they studied: Whether adding folic acid to foods changed the genetic risk factors for heart defects in newborns
- Who participated: 1,285 children with heart defects (534 with a specific type called conotruncal heart defects and 751 with other heart defects), all of European ancestry, born before and after folic acid fortification began
- Key finding: After folic acid fortification started, certain genetic variants that increase heart defect risk became less common, suggesting that better folate nutrition may have reduced the impact of these genetic risk factors
- What it means for you: This research suggests that getting enough folic acid during pregnancy may be especially important for people with certain genetic variants. If you’re planning pregnancy, adequate folate intake remains crucial, though this study doesn’t change current medical recommendations.
The Research Details
Researchers used genetic information from children with heart defects collected through a national research network. They compared the genes of children born before 1998 (when folic acid fortification wasn’t yet widespread) with children born after 2000 (when fortification was established). Using advanced genetic testing, they looked at millions of genetic variations to see which ones were more or less common in each group.
The scientists focused specifically on children of European ancestry to reduce genetic variation from different populations. They used a method called genome-wide association study (GWAS), which is like scanning the entire instruction manual of DNA to find which parts changed over time. They also looked at which biological pathways these genetic changes affected, essentially asking: what cellular processes do these genes control?
This approach is important because it shows how public health interventions (like adding nutrients to food) can actually change which genetic factors matter for disease. Instead of just looking at genes in isolation, this study examined how genes interact with nutrition. This helps us understand that genetics isn’t destiny—environmental factors like nutrition can modify genetic risk.
The study used standardized genetic sequencing and careful data processing to minimize errors. The researchers analyzed a reasonably large sample of 1,285 children with detailed genetic information. However, the study only included people of European ancestry, so results may not apply equally to other populations. The findings are preliminary (marked as ’nominally enriched’), meaning they suggest patterns but would need confirmation in future studies before being considered definitive.
What the Results Show
The most striking finding involved two specific genetic variants in a gene called DHRS3. These variants were about twice as common in children born before fortification (odds ratio 2.10 and 2.21), meaning they were more frequently associated with heart defects when folate intake was lower. This suggests that when mothers had adequate folic acid, these genetic risk factors became less important.
For children with the specific type of heart defect studied (conotruncal heart defects), four genetic variants in another gene called PPARGC1β showed even stronger patterns, appearing about 4.5 times more often in the pre-fortification group. This gene is involved in how cells produce energy and develop properly during heart formation.
Across all children with any type of heart defect, eight genetic locations showed similar patterns of being more common before fortification. The researchers also found that the genes involved in these patterns control processes directly related to how the heart develops in the womb.
The biological pathways affected by these genetic variants are specifically involved in cardiac development—the process of how a baby’s heart forms. This is important because it suggests the genetic changes aren’t random; they’re in genes that actually control heart development. The findings also hint that folate may work by influencing how these developmental genes function, rather than just preventing general birth defects.
Previous research has long shown that folate deficiency increases heart defect risk, and that folic acid fortification reduced these defects by about 25-30% nationally. This study adds a new layer by showing that fortification may have actually shifted which genetic variants pose the greatest risk. It suggests that the relationship between genes and nutrition is more complex than previously understood—nutrition doesn’t just reduce overall risk, it may change the relative importance of different genetic factors.
The study only included people of European ancestry, so we don’t know if these patterns hold for other populations with different genetic backgrounds. The findings are preliminary and based on statistical patterns that need confirmation. The study couldn’t directly measure mothers’ folate levels, so it infers nutrition changes from the fortification policy. Additionally, the study examined associations over time but cannot prove that fortification caused the genetic changes—other factors could have contributed.
The Bottom Line
Pregnant women and those planning pregnancy should ensure adequate folic acid intake (400 micrograms daily per current guidelines). This research provides additional evidence that folate status during pregnancy is important, particularly for people with certain genetic backgrounds. The findings don’t change current medical recommendations but strengthen the rationale for them. Confidence level: Moderate—the findings are suggestive but preliminary.
Women of childbearing age, particularly those with family history of heart defects, should pay attention to folate intake. Healthcare providers may find this useful for understanding gene-nutrient interactions. The general public should understand that public health measures like food fortification can have effects beyond what was initially expected. This research is less immediately relevant to people not planning pregnancy, though it illustrates broader principles about nutrition and genetics.
The effects of adequate folate intake during pregnancy on reducing genetic risk would manifest during fetal development (the 9 months of pregnancy). The population-level effects shown in this study took decades to become apparent as birth cohorts accumulated. Individual women wouldn’t notice changes in their own genes, but their babies would be born with reduced genetic risk for heart defects if they maintained adequate folate intake.
Frequently Asked Questions
Does folic acid prevent heart defects in babies?
Folic acid significantly reduces the risk of certain heart defects, particularly conotruncal heart defects. A 2026 study found that folic acid fortification changed which genetic variants increase heart defect risk, with some variants becoming 2-4 times less common after fortification began. Current guidelines recommend 400 micrograms daily for women of childbearing age.
Can genes for heart defects be changed by nutrition?
Your genes themselves don’t change, but nutrition can affect how much genetic risk factors matter. This 2026 study of 1,285 children showed that adequate folic acid intake reduced the impact of certain genetic variants on heart defect risk, demonstrating important gene-nutrient interactions during fetal development.
Should I take folic acid supplements if I’m planning to get pregnant?
Yes. Current medical guidelines recommend 400 micrograms of folic acid daily for all women of childbearing age who could become pregnant. This research provides additional evidence supporting this recommendation, showing that adequate folate status during pregnancy reduces genetic risk for heart defects.
What foods have folic acid naturally?
Leafy greens (spinach, kale), legumes (beans, lentils), asparagus, Brussels sprouts, and avocado are naturally rich in folate. Many grain products are fortified with folic acid. Most prenatal vitamins also contain folic acid to ensure adequate intake during pregnancy.
Does this research change current pregnancy recommendations?
This research doesn’t change current guidelines but strengthens the evidence supporting them. It shows that folic acid fortification had measurable effects on genetic risk factors for heart defects, reinforcing why adequate folate intake during pregnancy remains crucial for preventing birth defects.
Want to Apply This Research?
- Track daily folic acid intake in micrograms, aiming for 400 mcg minimum for women of childbearing age, or 600 mcg if pregnant. Log sources: fortified cereals, leafy greens, legumes, and supplements.
- Set a daily reminder to take a prenatal vitamin or folic acid supplement if planning pregnancy or currently pregnant. Add one folate-rich food to each meal (spinach in breakfast smoothie, beans in lunch, asparagus at dinner).
- Track consistency of folic acid intake over weeks and months rather than daily fluctuations. Monitor for any pregnancy planning milestones. Note dietary sources versus supplementation to ensure adequate intake from multiple sources.
This research is preliminary and published in a preprint format. The findings suggest associations between folic acid fortification and genetic risk factors but do not establish definitive causation. This information is for educational purposes and should not replace professional medical advice. Women planning pregnancy or currently pregnant should consult with their healthcare provider about appropriate folic acid supplementation. The study was limited to individuals of European ancestry and may not apply equally to other populations. Always follow current medical guidelines from organizations like the CDC and ACOG regarding prenatal nutrition and supplementation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.