According to Gram Research analysis, a 2026 cross-sectional study of 1,071 pregnant women found that those eating more inflammatory foods had a 26% higher risk of gestational diabetes for each unit increase on the Dietary Inflammatory Index. The association was statistically significant, though sensitivity analyses showed mixed results, suggesting the relationship may be more complex than initially apparent. Researchers emphasized that while dietary inflammation appears linked to gestational diabetes risk, the connection is not yet proven to be causal.
A new study of over 1,000 pregnant women in China found that eating more inflammatory foods during pregnancy may be linked to gestational diabetes, a type of diabetes that develops during pregnancy. Researchers asked women about their diet and then tested them for gestational diabetes around 24 to 28 weeks of pregnancy. Women who ate diets that caused more inflammation in their bodies had higher chances of developing gestational diabetes. However, the researchers noted that the connection wasn’t perfectly consistent across all their analyses, suggesting more research is needed to fully understand this relationship.
Key Statistics
A 2026 cross-sectional study of 1,071 pregnant women in Suzhou, China found that each one-unit increase in the Dietary Inflammatory Index was associated with a 26% higher odds of gestational diabetes (OR 1.26, 95% CI 1.06 to 1.51, P = 0.011).
Among 1,071 pregnant women studied, 225 (21%) developed gestational diabetes, with those consuming more inflammatory diets showing elevated risk compared to those with less inflammatory eating patterns.
When researchers limited analysis to 803 women who completed dietary questionnaires closest to their diabetes screening test, the association between inflammatory diet and gestational diabetes became weaker and no longer statistically significant (OR 1.20, 95% CI 0.97 to 1.48).
The study found no evidence of a nonlinear relationship between dietary inflammation and gestational diabetes risk, suggesting that risk increases gradually rather than jumping at specific inflammation thresholds.
The Quick Take
- What they studied: Whether eating foods that trigger inflammation in the body increases the risk of gestational diabetes, a temporary diabetes that some women develop during pregnancy.
- Who participated: 1,071 pregnant women in their mid-to-late pregnancy (around 24 to 28 weeks) from three major hospitals in Suzhou, China. The average age was 29 years old, and most had a healthy weight before pregnancy.
- Key finding: Women whose diets were more inflammatory had a 26% higher risk of gestational diabetes for each unit increase on the inflammation scale. This finding was statistically significant, meaning it’s unlikely to be due to chance alone.
- What it means for you: If you’re pregnant or planning to become pregnant, choosing less inflammatory foods may help reduce your gestational diabetes risk. However, this study shows a connection, not proof that diet causes the disease. Talk to your doctor about dietary choices during pregnancy.
The Research Details
This was a cross-sectional study, which means researchers collected information from many women at one point in time rather than following them over months or years. Between February and November 2025, pregnant women at three hospitals in Suzhou, China filled out detailed questionnaires about what they ate during the three months before their gestational diabetes screening test. The researchers used a scoring system called the Dietary Inflammatory Index, which rates foods based on how much they increase or decrease inflammation in the body. Foods like refined grains, sugary drinks, and processed meats increase inflammation, while fruits, vegetables, and whole grains decrease it. The women also took a standard glucose tolerance test, which measures how well their bodies handle sugar, to determine if they had gestational diabetes.
This research approach is important because gestational diabetes affects about 1 in 5 pregnant women and can lead to complications for both mother and baby. By studying real pregnant women and their actual eating patterns, researchers can identify dietary factors that might increase risk. The Dietary Inflammatory Index is a useful tool because it looks at the overall inflammatory potential of someone’s entire diet, not just individual foods. This gives a more complete picture than studying single nutrients or foods in isolation.
The study was conducted at multiple hospitals, which strengthens the findings by including women from different settings. The researchers carefully adjusted their analysis for many factors that could affect the results, including age, income, weight, and exercise habits. However, the study has some limitations. The questionnaire asked women to remember what they ate three months earlier, which can be inaccurate. Also, the timing of when women filled out the food questionnaire relative to their diabetes test varied, which may have affected the results. The researchers acknowledged these limitations and noted that their findings don’t prove diet causes gestational diabetes.
What the Results Show
Among the 1,071 women studied, 225 (about 21%) developed gestational diabetes. The average Dietary Inflammatory Index score was 0.71, with scores ranging widely among participants. When researchers looked at the continuous scale, each one-point increase in the inflammation score was associated with a 26% higher odds of gestational diabetes. This relationship was statistically significant, with a P-value of 0.011, meaning there’s only about a 1% chance this finding occurred by random chance. However, when the researchers divided women into four groups based on their inflammation scores and compared the highest group to the lowest, the trend was no longer statistically significant. This inconsistency suggests the relationship may be more complex than a simple linear pattern.
When researchers looked only at women who completed the food questionnaire very close to their diabetes test (one to three days before), the association between inflammatory diet and gestational diabetes became weaker and less certain. The study found no evidence of a nonlinear relationship, meaning the risk didn’t jump dramatically at certain inflammation levels. The average age of participants was 29 years, and their average weight before pregnancy was in the healthy range, suggesting the findings may apply to women with typical pregnancy profiles.
Previous research on this topic has shown mixed results, with some studies finding a link between inflammatory diets and gestational diabetes while others found no connection. This study adds to the growing body of evidence suggesting that diet quality and inflammation may play a role in gestational diabetes risk. However, the inconsistent findings across different analyses in this study highlight why previous research has been conflicting. The researchers noted that their results align with studies showing that inflammatory markers in the blood are associated with gestational diabetes, but the dietary connection is less clear-cut.
The study has several important limitations. First, women reported what they ate three months earlier, which relies on memory and can be inaccurate. Second, the timing of the food questionnaire varied relative to the diabetes test, which could have affected results. Third, this is a cross-sectional study, meaning it captures one moment in time and cannot prove that diet causes gestational diabetes. Fourth, the inconsistency between the continuous analysis (which showed a significant relationship) and the quartile analysis (which did not) raises questions about the true strength of the association. Finally, the study was conducted in one city in China, so results may not apply to all populations.
The Bottom Line
Pregnant women should aim to eat a diet rich in whole grains, fruits, vegetables, and lean proteins while limiting processed foods, sugary drinks, and refined grains. This dietary pattern is generally recommended during pregnancy for overall health and may help reduce gestational diabetes risk. However, this single study provides moderate evidence, not definitive proof. Work with your healthcare provider or a registered dietitian to develop a personalized nutrition plan during pregnancy.
This research is most relevant to pregnant women, especially those with risk factors for gestational diabetes such as family history of diabetes, overweight status, or previous gestational diabetes. Healthcare providers caring for pregnant women should be aware of the potential link between inflammatory diets and gestational diabetes risk. Women planning to become pregnant may also benefit from adopting a less inflammatory diet. The findings are less directly applicable to non-pregnant individuals, though the general principle that inflammatory diets may affect health is widely supported.
If a pregnant woman changes her diet to reduce inflammation, she would not see a change in gestational diabetes risk immediately. Gestational diabetes develops gradually during pregnancy, and dietary changes made early in pregnancy (before 24 weeks) would have the most potential impact. Women should discuss timing of dietary changes with their healthcare provider, as gestational diabetes is typically screened for around 24 to 28 weeks of pregnancy.
Frequently Asked Questions
What is the dietary inflammatory index and how does it relate to gestational diabetes?
The Dietary Inflammatory Index is a scoring system that rates foods based on how much they increase or decrease inflammation in your body. This 2026 study found that pregnant women with higher inflammation scores had a 26% increased risk of gestational diabetes, though the relationship wasn’t perfectly consistent across all analyses.
Can changing my diet prevent gestational diabetes during pregnancy?
This study shows a connection between inflammatory foods and gestational diabetes risk, but doesn’t prove diet prevents it. Eating more anti-inflammatory foods like fruits, vegetables, and whole grains is generally recommended during pregnancy. Consult your doctor about personalized dietary recommendations for your pregnancy.
Which foods increase inflammation and should I avoid during pregnancy?
Pro-inflammatory foods include refined grains, sugary drinks, processed meats, and fried foods. Anti-inflammatory foods include fruits, vegetables, whole grains, fish, nuts, and legumes. A balanced diet emphasizing whole foods over processed options is recommended during pregnancy.
How reliable is this study for predicting my gestational diabetes risk?
This study provides moderate evidence of a link between inflammatory diet and gestational diabetes, but has limitations. Women reported past diet from memory, which can be inaccurate. The findings don’t prove diet causes gestational diabetes. Talk to your healthcare provider about your individual risk factors and prevention strategies.
Should all pregnant women worry about dietary inflammation?
All pregnant women benefit from eating a healthy diet rich in whole foods. This study suggests that reducing inflammatory foods may lower gestational diabetes risk, but individual risk varies based on genetics, weight, and other factors. Discuss personalized nutrition with your healthcare provider.
Want to Apply This Research?
- Track daily inflammatory food intake by logging meals and assigning each a simple score: green for anti-inflammatory foods (berries, leafy greens, fish), yellow for neutral foods (whole grains, lean meats), and red for pro-inflammatory foods (sugary drinks, processed snacks, fried foods). Aim for 80% green and yellow meals daily.
- Replace one processed food or sugary drink per day with an anti-inflammatory alternative. For example, swap soda for water with lemon, or replace white bread with whole grain bread. Track this swap in the app and celebrate weekly consistency milestones.
- Weekly review of inflammation score trends alongside blood sugar readings if available. Set reminders to log meals at consistent times. Monitor energy levels and pregnancy symptoms to correlate with dietary patterns. Share weekly summaries with your healthcare provider during prenatal visits.
This article summarizes research findings and should not be considered medical advice. Gestational diabetes is a serious condition that requires professional medical diagnosis and management. If you are pregnant or planning to become pregnant, consult with your healthcare provider or a registered dietitian before making significant dietary changes. This study shows an association between inflammatory diet and gestational diabetes risk but does not prove causation. Individual risk factors vary, and personalized medical guidance is essential for your specific situation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.