Nutrition during pregnancy is a topic that generates enormous interest — and, unfortunately, an enormous amount of conflicting and sometimes overwhelming advice. For women pregnant after 35, this landscape can feel even more intense, with the addition of age-related considerations layered on top of general prenatal nutrition recommendations. This article aims to provide a clear, research-grounded overview of key nutrients during pregnancy, without prescribing a specific regimen.
Individual nutritional needs during pregnancy vary based on pre-pregnancy diet, health history, lab values, and other factors. The appropriate nutrition plan for your pregnancy is best developed with your OB/GYN or a registered dietitian who can assess your individual situation — not from a general article. That said, having a foundational understanding of the nutrients most discussed in prenatal care can help you have more informed conversations with your provider.
Folate and Folic Acid: The Preconception and Early Pregnancy Nutrient
Folate — and its synthetic form, folic acid — has the most established evidence base in prenatal nutrition. According to the Centers for Disease Control and Prevention, adequate folic acid intake in the weeks before and after conception is associated with a significantly reduced risk of neural tube defects — structural differences affecting the brain and spinal cord that develop very early in pregnancy, often before a woman knows she is pregnant.
The standard recommendation for women who may become pregnant is 400 micrograms of folic acid daily, typically from a supplement or fortified foods, in addition to dietary folate. Women with certain risk factors — including a personal or family history of neural tube defects or certain medications — may be advised to take higher doses, which is a discussion for your healthcare provider.
Most prenatal vitamins contain folic acid at or above the standard recommendation, though the form of folate (folic acid vs. methylfolate) is a topic of discussion for women with certain genetic variations affecting folate metabolism. This is worth discussing with your provider if relevant to your history.
Iron: Increasing Needs During Pregnancy
Iron requirements increase substantially during pregnancy to support the expansion of maternal blood volume, placental development, and fetal iron stores. The recommended daily intake of iron during pregnancy is generally cited at 27 mg — significantly higher than the 18 mg recommended for non-pregnant women of reproductive age.
Many prenatal vitamins include iron, typically at or near this level. However, absorption varies considerably based on dietary context, and some women — particularly those who began pregnancy with lower iron stores due to heavy periods or dietary patterns — may need additional supplementation.
Iron status is routinely screened during prenatal care through hemoglobin and sometimes ferritin testing. For more background on iron in the context of reproductive health, the article on iron levels and fertility after 35 provides useful context.
Calcium and Vitamin D: Supporting Bone Health and More
Calcium requirements during pregnancy remain similar to non-pregnant recommendations (approximately 1,000 mg/day for women 19–50), as the body becomes more efficient at absorbing calcium during pregnancy. However, if dietary calcium is insufficient, the body draws from maternal bone stores to meet fetal needs — making adequate intake important for long-term maternal bone health.
Vitamin D plays an important role in calcium absorption, immune function, and potentially in pregnancy outcomes. Research has explored associations between vitamin D status and various pregnancy outcomes, though the evidence for supplementation beyond correcting deficiency is still evolving. Vitamin D deficiency is relatively common, and many prenatal vitamins include vitamin D at recommended levels. Your provider can test your vitamin D levels and advise on appropriate supplementation based on your individual status.
The Calcium-Vitamin D Synergy
These two nutrients work together — adequate vitamin D is needed for optimal calcium absorption, and the two are often discussed in tandem in prenatal nutrition. Most standard prenatal vitamins include both, though the amounts and forms vary between products.
Omega-3 Fatty Acids: DHA and Fetal Brain Development
DHA (docosahexaenoic acid), an omega-3 fatty acid, is concentrated in the brain and retina and plays an important role in fetal neurological and visual development. Research has explored the relationship between maternal DHA intake and various developmental outcomes in offspring, with some evidence suggesting benefits of adequate DHA intake during pregnancy.
DHA is found primarily in fatty fish — such as salmon, sardines, and mackerel — and in algae (the primary source for plant-based options). Recommended intake during pregnancy is generally around 200–300 mg of DHA per day, though recommendations vary by organization. Many prenatal vitamins do not contain sufficient DHA, which is one reason some providers recommend a separate omega-3 supplement during pregnancy — particularly for women who do not regularly eat fatty fish.
Fish consumption during pregnancy also comes with considerations around mercury exposure, as some fish are high in mercury, which can affect fetal neurological development. The FDA and EPA provide guidance on fish choices during pregnancy that balance the benefits of DHA with mercury concerns — your provider can advise on what this means for your diet.
Iodine: An Often Overlooked Prenatal Nutrient
Iodine is essential for thyroid hormone production, and thyroid hormones play a critical role in fetal brain development — particularly in the first trimester. Iodine deficiency is associated with significant developmental risks, and global public health efforts have focused on iodine sufficiency in populations.
In the United States, iodine is available from iodized salt, dairy products, seafood, and eggs. However, some prenatal vitamins do not contain iodine, and women who use non-iodized sea salt, follow plant-based diets, or avoid dairy may be at risk of insufficiency. Checking the label of your prenatal vitamin for iodine content — and discussing your iodine status with your provider — is a reasonable step.
Choline: A Less Familiar but Important Nutrient
Choline is involved in fetal brain and spinal cord development and is found in foods including eggs, meat, fish, and some legumes. Despite its importance, choline is often underrepresented in prenatal vitamins and in prenatal nutrition discussions. Research from the NIH has explored choline’s role in reducing neural tube defect risk (alongside folate) and in supporting cognitive development. Current recommendations suggest 450 mg/day during pregnancy. Women who do not eat eggs or meat may be particularly at risk of insufficient intake and may benefit from specific guidance from a registered dietitian.
For a broader understanding of nutrition in the context of fertility before pregnancy, exploring resources on nutrition and fertility after 35 may offer helpful context for the preconception period.
Frequently Asked Questions
Is a standard prenatal vitamin enough, or do I need additional supplements?
This depends on your individual nutritional status, diet, and any specific risk factors identified by your healthcare provider. Standard prenatal vitamins cover many key nutrients at baseline levels, but some nutrients — such as DHA, choline, and sometimes iodine — may be insufficient in many off-the-shelf prenatal vitamins. Discussing your specific prenatal vitamin with your OB/GYN or a registered dietitian can help identify any gaps.
Are there any nutrients I should specifically discuss because I’m over 35?
Age-related considerations in prenatal nutrition largely center on ensuring adequate levels of nutrients that support overall health — including iron (given more common history of heavy periods), vitamin D (which tends to be low in many adults), and omega-3s. Your provider may also monitor thyroid function more closely after 35, given that thyroid conditions are somewhat more common with age and can affect pregnancy. Testing your nutrient levels is the most individualized approach rather than supplementing based on general age assumptions.
Can I get all the nutrients I need from food alone during pregnancy?
For many nutrients, a well-varied diet can provide adequate levels — but folic acid is typically recommended as a supplement because the timing of adequate intake (before and immediately after conception) is difficult to ensure through diet alone. DHA may also be challenging to obtain in sufficient amounts without regular fatty fish consumption. A prenatal vitamin serves as a nutritional safety net, not a replacement for a healthy diet, and combining both is the general recommendation.
Is it safe to eat fish during pregnancy?
Yes — fish is generally recommended during pregnancy as a valuable source of DHA, protein, and other nutrients. The FDA advises choosing lower-mercury options (such as salmon, shrimp, tilapia, and cod) while limiting or avoiding high-mercury fish (such as shark, swordfish, king mackerel, and bigeye tuna). The specific recommendation is 2–3 servings per week of lower-mercury fish. Your provider can offer guidance tailored to your dietary preferences and any specific concerns.
Key Takeaways
- Folate/folic acid has the strongest evidence base in prenatal nutrition, with clear associations between adequate intake around conception and reduced neural tube defect risk.
- Iron needs increase significantly during pregnancy; testing iron status during prenatal care guides appropriate supplementation.
- DHA is important for fetal brain development and may need to be supplemented separately, as many prenatal vitamins contain insufficient amounts — particularly for women who do not eat fatty fish.
- Iodine and choline are important but often underrepresented in prenatal vitamins and prenatal nutrition discussions; discussing these with your provider or a registered dietitian is worthwhile.
- Individual nutritional needs during pregnancy are best assessed through testing and personalized guidance from your healthcare team rather than through general supplementation protocols.
Medical Disclaimer
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.