According to Gram Research analysis, pregnant women who follow U.S. Dietary Guidelines more closely have lower exposure to some harmful chemicals like phthalates (reduced by 13.5%) but higher exposure to others like benzophenone-3 in sunscreen (increased by 16.2%). A 2026 study of 1,492 pregnant women found that eating more vegetables, fruits, whole grains, and protein reduced several types of chemical exposure, but healthy eating alone cannot eliminate all environmental toxins during pregnancy.
A new study of nearly 1,500 pregnant women found that following healthy eating guidelines reduces exposure to some harmful chemicals but increases exposure to others. Researchers measured 113 different chemicals in urine samples and discovered that women who ate more vegetables, fruits, whole grains, and protein had lower levels of certain pesticides and plastics. However, these same women had higher levels of chemicals found in sunscreen and personal care products. The findings suggest that healthy eating is still important, but it’s only part of the solution for reducing chemical exposure during pregnancy.
Key Statistics
A 2026 cohort study of 1,492 pregnant women found that higher adherence to U.S. Dietary Guidelines was associated with 13.5% lower levels of monobenzyl phthalate, a chemical found in plastics and personal care products.
According to research reviewed by Gram, pregnant women following dietary guidelines more closely had 16.2% higher levels of benzophenone-3, a UV filter in sunscreen, suggesting that healthy eating patterns may increase exposure to some chemicals.
A study of 1,492 pregnant women detected 45 different chemical biomarkers in more than 30% of participants, with lower added sugar and higher vegetable intake being consistent predictors of reduced chemical exposure across multiple toxin classes.
Research from the Environmental influences on Child Health Outcomes Cohort found that while dietary guideline adherence reduced exposure to organophosphate esters, halogenated phenols, and bisphenols, it did not protect against increased paraben and insecticide exposure.
The Quick Take
- What they studied: Whether pregnant women who follow the U.S. Dietary Guidelines are exposed to fewer harmful chemicals in their bodies
- Who participated: 1,492 pregnant women in their fifth month of pregnancy, mostly White (40%) or Black (36%), with half earning at least $50,000 per year
- Key finding: Following dietary guidelines reduced exposure to some chemicals like phthalates (found in plastics) by up to 13.5%, but increased exposure to others like benzophenone-3 (found in sunscreen) by 16.2%
- What it means for you: Eating healthy during pregnancy is still important, but it won’t protect you from all chemical exposures. You may need additional strategies like choosing products without certain chemicals or avoiding specific foods known to contain pesticides
The Research Details
Researchers followed pregnant women in the Environmental influences on Child Health Outcomes Cohort, a large study tracking how environmental factors affect child development. At around 21 weeks of pregnancy, women reported everything they ate using either a detailed food questionnaire or a 24-hour food diary. The researchers calculated a “Healthy Eating Index” score based on how well each woman followed official U.S. dietary guidelines. At the same time, the researchers collected urine samples and tested them for 113 different chemicals from 10 major groups, including pesticides, chemicals in plastics, and compounds in personal care products. They then compared the chemical levels in women with high versus low healthy eating scores.
This approach is important because it shows real-world chemical exposure in actual pregnant women, not in laboratory conditions. By measuring chemicals in urine, researchers captured what women were actually absorbing into their bodies. The study looked at many chemicals at once, which is more realistic than studying one chemical in isolation. This helps us understand whether healthy eating truly protects against environmental toxins during a critical time for fetal development.
This study has several strengths: it included a large, diverse group of pregnant women; it measured many chemicals simultaneously; and it used statistical methods designed to handle complex data. However, the study only measured chemicals at one point in time during pregnancy, so we don’t know if exposure changed throughout pregnancy. The study also couldn’t prove that diet directly caused the chemical differences—only that they were associated. Additionally, the study relied on women remembering what they ate, which can be inaccurate.
What the Results Show
Women who followed dietary guidelines more closely had significantly lower levels of several types of chemicals. For phthalates (chemicals in plastics and personal care products), the reduction was 13.5% for every 10-point increase in the healthy eating score. Organophosphate esters (flame retardants), halogenated phenols (disinfectants), bisphenols (plastics), and polycyclic aromatic hydrocarbons (from cooking and pollution) were all lower in women eating healthier diets. The biggest protective effect came from eating less added sugar and more protein, vegetables, fruits, and whole grains. These dietary changes appeared to reduce exposure to multiple chemical classes simultaneously.
Surprisingly, women with higher healthy eating scores had higher levels of some chemicals. Benzophenone-3, a UV filter in sunscreen and cosmetics, was 16.2% higher in women following guidelines better. Insecticide and paraben levels (found in personal care products) were also higher. This unexpected finding suggests that healthier foods may contain more of these chemicals, possibly because organic or premium products use different preservatives, or because fruits and vegetables treated with certain pesticides were more common in the diets of guideline-following women.
Previous research has shown that diet influences chemical exposure, but most studies focused on single chemicals. This study is among the first to examine whether following official dietary guidelines protects against multiple chemical classes simultaneously. The finding that healthy eating reduces some but not all chemical exposures aligns with emerging research suggesting that no single dietary approach eliminates all environmental toxins. The unexpected increase in some chemicals challenges the assumption that healthy eating automatically means lower total chemical exposure.
The study measured chemicals only once during pregnancy, so we don’t know if exposure was higher or lower at other times. Women self-reported their diet, which can be inaccurate. The study couldn’t prove that diet caused the chemical differences—only that they were associated. Some chemicals were detected in very few women, making results less reliable. The study population was mostly White and Black women with moderate to higher incomes, so results may not apply to all pregnant populations. Finally, the study couldn’t determine whether the chemical levels detected actually posed health risks to the pregnancy or baby.
The Bottom Line
Pregnant women should continue following U.S. Dietary Guidelines because the overall evidence supports their benefits for pregnancy health. However, recognize that healthy eating alone won’t eliminate all chemical exposure. Consider additional steps: wash produce thoroughly, choose organic for the “Dirty Dozen” produce items when possible, avoid plastic food storage containers when feasible, and limit processed foods. Discuss specific concerns with your healthcare provider. Confidence level: Moderate—the study shows associations but not definitive cause-and-effect.
All pregnant women should care about this research, especially those concerned about environmental toxins. Women planning pregnancy may want to review their diet before conception. Healthcare providers should use this to counsel patients that diet is one tool among many for reducing chemical exposure. The findings are less relevant for non-pregnant individuals, though the principles may apply to anyone concerned about chemical exposure.
If you change your diet to follow guidelines more closely, chemical levels in your body may begin shifting within weeks, though the study didn’t track this directly. Significant reductions in some chemicals might take several months of consistent dietary changes. However, some chemicals (like those in sunscreen) may increase if you use more personal care products, so benefits may take longer to see overall.
Frequently Asked Questions
Does eating healthy during pregnancy reduce chemical exposure?
Partially. A 2026 study of 1,492 pregnant women found that following dietary guidelines reduced exposure to phthalates by 13.5% and several other chemicals, but increased exposure to benzophenone-3 by 16.2%. Healthy eating helps with some toxins but not all.
What foods should pregnant women avoid to reduce chemical exposure?
The study found that reducing added sugar and eating more vegetables, fruits, whole grains, and protein lowered exposure to most chemicals. Consider washing produce thoroughly and choosing organic for heavily-pesticide-treated items when possible.
Can I eliminate all chemical exposure during pregnancy through diet?
No. According to Gram Research analysis, diet is only one factor. The 2026 study showed that even women following dietary guidelines had measurable chemical exposure. Additional strategies like avoiding plastic containers and limiting personal care products may help further reduce exposure.
Which chemicals are most reduced by healthy eating in pregnancy?
A study of 1,492 pregnant women found that dietary guideline adherence most strongly reduced phthalates (13.5% reduction), organophosphate esters, halogenated phenols, bisphenols, and polycyclic aromatic hydrocarbons from cooking and pollution.
Are the chemical levels found in pregnant women dangerous to the baby?
The study measured chemical presence but didn’t determine health risks. Discuss specific concerns with your healthcare provider, who can assess whether detected levels pose actual danger based on current medical evidence and your individual situation.
Want to Apply This Research?
- Track your Healthy Eating Index score weekly by logging servings of vegetables, fruits, whole grains, protein, and added sugars. Aim for a score of 70 or higher (out of 100) and monitor how your dietary adherence changes over time.
- Use the app to set a specific goal like “add one extra vegetable serving daily” or “reduce added sugar by 10 grams per day.” Log meals and get real-time feedback on how well you’re following dietary guidelines, with specific suggestions for swaps that improve your score.
- Create a monthly dashboard showing your average Healthy Eating Index score and trends over time. Set reminders to log meals consistently, and use the app’s insights to identify which dietary components need improvement. Track any changes in how you feel as you improve your diet adherence.
This article summarizes research findings and should not replace professional medical advice. Pregnant women should consult with their healthcare provider before making significant dietary changes or taking steps to reduce chemical exposure. The chemical levels detected in this study have not been established as harmful at the concentrations measured. Individual health risks depend on many factors beyond diet. This research shows associations, not definitive cause-and-effect relationships. Always discuss pregnancy health concerns with your obstetrician or midwife.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.