A mother’s diet during pregnancy may play a critical role in her child’s long-term immune health, according to new Danish research. The study, published in the Journal of Epidemiology & Community Health, suggests that a diet high in inflammation-promoting foods during pregnancy is linked to a higher risk of type 1 diabetes in children.
Researchers found that for every one-point increase in an inflammatory diet score, the risk of a child developing type 1 diabetes rose by 16%.
Inflammatory Diet Linked to Higher Diabetes Risk
The researchers developed a special dietary inflammation score based on blood samples from over 2,500 Norwegian mothers. They used this data to assess how certain foods affect inflammation levels. This score was then applied to data from more than 67,000 mother-child pairs in the Danish National Birth Cohort, collected between 1996 and 2002.
Type 1 diabetes is an autoimmune condition that destroys insulin-producing cells in the pancreas, requiring lifelong insulin treatment. The condition is becoming more common, especially in developed countries, with annual increases of about 3–4%. Scientists believe environmental factors, including maternal diet, could play a key role.
Study Method and Findings
Mothers in the study filled out detailed food questionnaires around the 25th week of pregnancy. These covered 360 food items grouped into 38 categories. Each woman received a dietary score based on how likely her food choices were to trigger inflammation.
Foods that increased inflammation included red meat, low-fat dairy, pizza, margarine, potatoes, low-energy drinks, French fries, and salty snacks. Foods linked to lower inflammation included onions, garlic, tomatoes, whole grains, leafy greens, coffee, tea, dark meat fish, and fruits.
The average follow-up period for the children was 17 years. During that time, 281 children (0.42%) developed type 1 diabetes, with most diagnosed around the age of 10.
Even after adjusting for other risk factors, researchers found that children born to mothers with higher inflammation scores had a significantly higher risk of developing diabetes.
Other Risk Factors Observed
Several other maternal factors were linked to higher inflammation scores, including being younger, smoking beyond the first trimester, higher body weight, lower alcohol intake, shorter breastfeeding duration, and lower socioeconomic status.
Interestingly, underweight mothers had a 76% greater chance of having a child who developed type 1 diabetes, regardless of their diet.
The study also noted that higher gluten intake during pregnancy might raise the risk. A 10-gram increase in gluten intake was linked to a 36% rise in diabetes risk in one of the statistical models.
Meanwhile, certain foods stood out for their stronger protective effect. Onions, garlic, and dark meat fish were particularly beneficial. In contrast, fruit juice did not show the same level of protection as whole fruits.
Surprising Role of Smoking
One unexpected finding was that mothers who smoked throughout pregnancy had a slightly lower risk of having a child with type 1 diabetes. However, smoking only in the first 12 weeks did not affect the risk. Researchers cautioned that this does not suggest smoking is protective and stressed that the health risks of smoking outweigh any potential link to diabetes.
Limitations and Conclusions
This was an observational study, so it cannot prove a direct cause-and-effect relationship. The researchers also did not track the children’s diets, which could influence the outcomes.
Still, they emphasized the growing evidence that a mother’s diet during pregnancy may shape her child’s immune system. A pro-inflammatory diet, higher gluten intake, and smoking all appeared to influence a child’s later risk of type 1 diabetes.
They concluded that mid-pregnancy may be a key period when the fetus is especially sensitive to maternal lifestyle factors, which could affect long-term health.
