According to Gram Research analysis, a 2026 study of 101 breastfeeding mothers found that maternal diet does influence inflammatory markers in breast milk, with a protein called MCP-1 showing a weak but statistically significant association with dietary inflammatory scores. Mothers eating more anti-inflammatory foods had slightly different inflammation profiles in their milk compared to those eating pro-inflammatory diets, though the effect was modest and more research is needed to understand the practical impact on infant health.
A new study looked at how a mother’s diet affects inflammation in her breast milk. Researchers studied 101 breastfeeding women and measured inflammatory markers (special proteins that show inflammation) in their milk. They compared these markers to each mother’s diet using a special scoring system. The study found that mothers eating more anti-inflammatory foods (like fruits, vegetables, and fish) had slightly different inflammation levels in their milk compared to mothers eating more pro-inflammatory foods (like processed foods and sugary items). This is the first research to explore this connection, and scientists say more studies are needed to understand how this might affect babies’ health.
Key Statistics
A 2026 study of 101 breastfeeding mothers published in PLOS ONE found that MCP-1, an inflammatory protein, was detected in more than 96% of breast milk samples and showed a weak but statistically significant correlation with maternal dietary inflammatory scores.
According to research reviewed by Gram, the correlation between maternal diet inflammatory status and MCP-1 levels in breast milk was weak (r² = -0.23, p = 0.025), suggesting that while diet influences this inflammatory marker, many other factors also play important roles.
A 2026 analysis of 101 lactating women found that mothers with pro-inflammatory diets had measurably different inflammatory marker profiles in their breast milk compared to mothers with anti-inflammatory diets, though the practical significance of these differences remains unclear.
The Quick Take
- What they studied: Whether the types of foods a breastfeeding mother eats change the levels of inflammation-related proteins in her breast milk
- Who participated: 101 healthy women who were actively breastfeeding their babies. The study measured what they ate using food recall interviews and tested their breast milk samples.
- Key finding: A protein called MCP-1 in breast milk showed a weak connection to mothers’ diet inflammation scores. Mothers eating more anti-inflammatory foods had slightly different milk inflammation profiles than those eating more pro-inflammatory foods.
- What it means for you: Your diet while breastfeeding may influence the composition of your milk, though the effect appears modest. Eating more whole foods and fewer processed foods might be beneficial, but more research is needed before making strong recommendations.
The Research Details
This was an observational study where researchers collected information from 101 breastfeeding mothers. Each mother reported everything she ate in a 24-hour period, which researchers then scored using the Dietary Inflammatory Index (DII)—a tool that rates foods as either pro-inflammatory (causing inflammation) or anti-inflammatory (reducing inflammation). The researchers then collected breast milk samples from these mothers and tested them for inflammatory markers using a special laboratory technique called cytometric bead array, which identifies and measures specific proteins related to inflammation.
The mothers were divided into two groups based on their DII scores: those with pro-inflammatory diets (scores above 0) and those with anti-inflammatory diets (scores below 0). The researchers then compared the inflammatory markers in the breast milk between these two groups to see if diet made a difference.
This research approach is important because breast milk is incredibly complex and contains many components that affect infant health. By measuring actual inflammatory markers in milk and connecting them to what mothers eat, researchers can understand whether dietary choices have real, measurable effects on milk composition. This is the first study to systematically examine this relationship.
This study has several strengths: it’s the first to examine this specific question, it used validated scientific methods to measure inflammation, and it studied a reasonable number of participants. However, the study has limitations. The sample size of 101 is relatively small, and the researchers only measured diet for one 24-hour period, which may not represent a mother’s typical eating patterns. The study also didn’t include diverse populations, so results may not apply to all mothers. The weak associations found suggest that diet’s effect on milk inflammation is modest, not dramatic.
What the Results Show
The study found that a protein called MCP-1 (monocyte chemoattractant protein-1) in breast milk showed a weak but statistically significant connection to mothers’ dietary inflammatory scores. This means that mothers eating more pro-inflammatory foods had slightly different levels of this protein in their milk compared to mothers eating more anti-inflammatory foods. However, the relationship was weak, meaning diet wasn’t the only factor affecting this protein level.
The researchers detected MCP-1 in more than 96% of the breast milk samples they tested, making it a common component of breast milk. The statistical correlation was weak (r² = -0.23), which means that while there was a connection between diet and this protein, many other factors also influence its levels. The p-value of 0.025 indicates this finding was statistically significant, meaning it’s unlikely to have happened by chance, but the practical effect size was small.
While the study focused primarily on MCP-1, the researchers measured other inflammatory markers as well. The fact that they found the strongest association with MCP-1 suggests this particular protein may be more sensitive to dietary changes than other inflammatory markers in breast milk. The study also revealed that inflammatory markers are naturally present in healthy breast milk, which is normal and expected.
This is the first study to directly examine the relationship between maternal dietary inflammatory status (using the DII score) and inflammatory markers in breast milk. Previous research has shown that maternal diet influences other components of breast milk, such as fatty acids and vitamins, but this is the first systematic investigation of inflammation-related proteins. The weak associations found here suggest that while diet does matter, it’s just one of many factors affecting breast milk composition.
The study has several important limitations. First, dietary intake was measured using only one 24-hour food recall, which may not represent what mothers typically eat. Second, the sample size of 101 mothers is relatively small for drawing broad conclusions. Third, the study included only healthy women from what appears to be a limited geographic area, so results may not apply to all mothers, especially those from different ethnic backgrounds or with different health conditions. Fourth, the associations found were weak, meaning diet’s effect on these specific inflammatory markers is modest. Finally, the study is observational, meaning researchers couldn’t prove that diet directly caused the changes in milk inflammation—only that an association exists.
The Bottom Line
Based on this research, breastfeeding mothers may benefit from eating more anti-inflammatory foods (fruits, vegetables, whole grains, fish, nuts, and olive oil) and fewer pro-inflammatory foods (processed foods, sugary drinks, and refined grains). However, confidence in this recommendation is moderate because the study found only weak associations. This research should be considered alongside other evidence about healthy eating during breastfeeding. Mothers should consult with their healthcare provider or a registered dietitian for personalized nutrition advice.
This research is relevant to all breastfeeding mothers who want to optimize their milk composition for their babies’ health. It’s also important for healthcare providers, lactation consultants, and nutritionists who advise pregnant and breastfeeding women. However, the findings are preliminary, and mothers shouldn’t feel guilty about their current diet based on this single study. The research is less relevant to mothers using formula, though the general principles of anti-inflammatory eating apply to everyone.
If a mother changes her diet to be more anti-inflammatory, changes in breast milk composition would likely occur within days to weeks, as breast milk composition can shift relatively quickly in response to dietary changes. However, the effects on infant health outcomes would take much longer to measure and would require long-term studies.
Frequently Asked Questions
Does what I eat while breastfeeding affect my baby through breast milk?
Yes, maternal diet influences breast milk composition, including inflammatory markers. A 2026 study of 101 mothers found that eating more anti-inflammatory foods (fruits, vegetables, fish) resulted in different inflammation profiles in milk compared to pro-inflammatory diets, though the effect was modest.
What foods should breastfeeding mothers eat to reduce inflammation in breast milk?
Anti-inflammatory foods include fruits, vegetables, whole grains, fatty fish, nuts, seeds, and olive oil. Limit processed foods, sugary drinks, and refined grains. However, research on this specific topic is still emerging, so consult a dietitian for personalized advice.
Can inflammatory markers in breast milk harm my baby?
Inflammatory markers are naturally present in healthy breast milk and serve important functions. The 2026 study found only weak associations between diet and these markers, suggesting they’re not a major concern. More research is needed to understand their impact on infant health.
How quickly does my diet change the composition of my breast milk?
Breast milk composition can shift within days to weeks of dietary changes, as milk is produced continuously from maternal blood. However, long-term studies are needed to determine how quickly inflammatory markers specifically respond to dietary changes.
Is this study large enough to trust its findings about diet and breast milk?
The study of 101 mothers is a good starting point but relatively small. The weak associations found suggest diet’s effect on these specific inflammatory markers is modest. More diverse, larger studies are needed before making strong recommendations.
Want to Apply This Research?
- Track daily anti-inflammatory food servings (fruits, vegetables, whole grains, fatty fish, nuts) and pro-inflammatory food servings (processed foods, sugary items, refined grains) to monitor dietary inflammatory status. Set a goal of 5+ anti-inflammatory servings daily.
- Use the app to log meals and receive real-time feedback on whether each meal is pro-inflammatory or anti-inflammatory. Create a simple meal plan featuring anti-inflammatory recipes suitable for breastfeeding mothers, with shopping lists and preparation tips.
- Track dietary inflammatory index score weekly and correlate it with wellness metrics like energy levels, mood, and sleep quality. Over months, users can observe patterns between their eating habits and how they feel, building motivation for sustained dietary improvements.
This research is preliminary and represents the first investigation of its kind. The findings show only weak associations between maternal diet and inflammatory markers in breast milk. This article is for educational purposes and should not replace personalized medical advice. Breastfeeding mothers should consult with their healthcare provider, registered dietitian, or lactation consultant before making significant dietary changes. Individual responses to dietary modifications vary, and more research is needed to understand the clinical significance of these findings for infant health outcomes.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.