A new study followed 430 mothers and their babies to see if eating a Mediterranean diet—lots of fruits, vegetables, fish, and olive oil—could help prevent food allergies in children. Researchers found that mothers who ate this healthy diet during pregnancy and while breastfeeding had babies with fewer food allergies. The study suggests that eating more fruits, vegetables, and full-fat dairy products is protective, while eating too much red meat and poultry might increase allergy risk. This research shows that what mothers eat can influence whether their babies develop food allergies, offering a natural way to help protect children’s health from the start.
The Quick Take
- What they studied: Whether mothers who eat a Mediterranean diet (lots of fruits, vegetables, whole grains, and healthy fats) have babies with fewer food allergies
- Who participated: 430 mother-baby pairs from the MEDALLION study, tracked during pregnancy and breastfeeding to see which babies developed food allergies
- Key finding: Mothers who followed a Mediterranean diet more closely had about a 6% lower chance of their babies developing food allergies. Eating more fruits, vegetables, and full-fat dairy seemed especially protective, while eating lots of red meat and poultry appeared to increase allergy risk.
- What it means for you: If you’re pregnant or planning to be, eating more Mediterranean-style foods—especially fruits, vegetables, and dairy—may help protect your baby from developing food allergies. However, this is one study, so talk with your doctor before making major diet changes.
The Research Details
This was a cohort study, which means researchers followed a group of mothers and their babies over time to see what happened naturally, rather than randomly assigning them to different diets. The mothers reported what they ate during pregnancy and while breastfeeding using a detailed food questionnaire. Researchers then tracked which babies developed food allergies and compared this to how closely each mother followed a Mediterranean diet pattern.
The Mediterranean diet is a way of eating based on the traditional diets of countries around the Mediterranean Sea. It emphasizes fruits, vegetables, whole grains, beans, nuts, olive oil, and fish, while limiting red meat and processed foods. Researchers used a scoring system to measure how well each mother followed this diet pattern.
The study looked at both the overall diet pattern and individual foods to understand which specific foods might be most important for preventing allergies in babies.
Cohort studies are valuable because they show real-world eating patterns and their actual effects on babies’ health. By following mothers over time, researchers could see which dietary choices were connected to fewer allergies. This approach is stronger than just asking people to remember what they ate years ago, because the information was collected while they were actually eating that way.
This study has several strengths: it used a validated food questionnaire (a tool that’s been proven to accurately measure diet), included a reasonable number of participants, and adjusted for other factors that might affect allergy risk. However, the study was observational, meaning researchers couldn’t prove that the diet caused the lower allergy rates—only that they were connected. The study also didn’t randomly assign mothers to different diets, so other lifestyle factors might have played a role.
What the Results Show
Mothers who more closely followed the Mediterranean diet had babies with lower odds of developing food allergies. For every point increase on the Mediterranean diet score during pregnancy, babies had about 6% lower odds of developing a food allergy. The same pattern held true during breastfeeding.
When researchers looked at specific foods, they found that eating more fruits during pregnancy was linked to lower allergy risk in babies. Similarly, eating more vegetables while breastfeeding was protective. Full-fat dairy products during pregnancy also appeared to help reduce allergy risk.
On the flip side, mothers who ate more red meat and poultry (more than 3 servings per week) during pregnancy and breastfeeding had babies with higher odds of developing food allergies. Eating fish more than once a week during pregnancy was also associated with increased allergy risk in babies.
The study identified specific food groups that seemed most important: fruits and full-fat dairy during pregnancy were particularly protective, while vegetables during breastfeeding offered the most protection during that period. The findings suggest that the overall pattern of eating matters, but certain foods within the Mediterranean diet may be especially important for preventing allergies. The study also showed that the timing matters—some foods were protective during pregnancy while others were more important during breastfeeding.
This research builds on growing evidence that what mothers eat affects their babies’ allergy risk. Previous studies have suggested that certain nutrients and foods during pregnancy and breastfeeding influence how a baby’s immune system develops. This study adds to that knowledge by showing that following an overall Mediterranean diet pattern may be beneficial, and by identifying which specific foods seem most important. The findings align with other research suggesting that diverse plant foods and healthy fats support immune development.
This study followed mothers and babies but couldn’t prove that the diet caused the lower allergy rates—only that they were connected. Mothers reported their own food intake, which might not be perfectly accurate. The study included 430 families, which is a decent size but not huge. The families in the study may not represent all populations, so results might differ in other groups. Additionally, researchers couldn’t account for all possible factors that might influence allergy development, such as genetics, environmental exposures, or infections during infancy.
The Bottom Line
If you’re pregnant or planning to become pregnant, consider eating more Mediterranean-style foods, especially fruits, vegetables, whole grains, legumes, nuts, and olive oil. Limit red meat and poultry to a few servings per week. Include full-fat dairy products in your diet. Continue these eating patterns while breastfeeding, with special attention to vegetables. These recommendations are based on moderate evidence from this study and align with general healthy eating guidelines. Talk with your doctor or a registered dietitian before making significant diet changes, especially if you have food allergies yourself or a family history of allergies.
Pregnant women and women planning pregnancy should pay attention to these findings, especially if they have a family history of food allergies. Women who are breastfeeding may also benefit from following these dietary guidelines. Parents of babies with food allergies might find this information helpful for understanding potential prevention strategies for future children. However, if your baby already has a food allergy, work with an allergist or dietitian on a safe eating plan rather than trying to prevent it through diet alone.
The benefits of following a Mediterranean diet during pregnancy and breastfeeding appear to develop gradually as the baby’s immune system develops. You wouldn’t see immediate changes, but rather a reduced likelihood of allergies developing over the baby’s first year and beyond. The protective effect seems to build throughout pregnancy and the breastfeeding period, so consistency matters more than perfection.
Want to Apply This Research?
- Track daily servings of fruits, vegetables, full-fat dairy products, and fish during pregnancy and breastfeeding. Set a goal of 3+ servings of fruits, 4+ servings of vegetables, and 2-3 servings of full-fat dairy daily. Monitor weekly red meat and poultry intake, aiming for 3 or fewer servings per week.
- Use the app to log meals and get real-time feedback on how closely you’re following a Mediterranean diet pattern. Set reminders to include more fruits and vegetables at each meal. Create a shopping list based on Mediterranean diet principles. Track which specific foods you’re eating to identify patterns and make adjustments.
- Review your diet adherence weekly to see trends. Compare your Mediterranean diet score over weeks and months. If using the app during pregnancy and breastfeeding, track any notes about your baby’s health and allergies to see if patterns emerge. Share reports with your healthcare provider to discuss how well you’re following the recommended eating pattern.
This research suggests an association between Mediterranean diet adherence during pregnancy and breastfeeding and reduced food allergy risk in babies, but it does not prove cause and effect. Individual results may vary based on genetics, environment, and other factors. If you are pregnant, breastfeeding, or have concerns about food allergies in your family, consult with your healthcare provider, registered dietitian, or allergist before making significant dietary changes. This information is not a substitute for professional medical advice, diagnosis, or treatment. Do not use this information to self-diagnose or treat food allergies.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.