Good nutrition during pregnancy is important at any age, but for women pregnant after 35, thoughtful attention to key nutrients can be particularly valuable. As the body navigates the demands of pregnancy alongside the natural physiological changes of the mid-thirties and beyond, ensuring adequate nutritional support is one area where informed choices — ideally made in partnership with a healthcare provider — can make a meaningful difference.
This overview covers some of the nutrients that research highlights as particularly important during pregnancy, with specific reference to considerations that may be relevant for women over 35. It is not a prescription or a complete dietary guide, but rather a starting point for conversations with your obstetric care team.
Folate and Folic Acid
Folate (the naturally occurring form) and folic acid (the synthetic form found in supplements and fortified foods) are among the most studied and consistently recommended nutrients in pregnancy. Adequate folate intake in the period around conception and through the first trimester is associated with a reduced risk of neural tube defects — conditions affecting the brain and spinal cord of the developing embryo.
According to the Centers for Disease Control and Prevention (CDC), women who could become pregnant are recommended to take 400 micrograms of folic acid daily, with higher doses sometimes recommended for women with specific risk factors. If you are planning a pregnancy or are newly pregnant, discussing your folic acid supplementation with your healthcare provider — including whether a higher dose is appropriate for your situation — is an important early step.
Iron
Iron requirements increase substantially during pregnancy due to the expansion of blood volume and the needs of the developing fetus and placenta. Iron deficiency anemia during pregnancy is associated with increased risk of preterm birth and low birth weight in research, and fatigue — which is already common in the first trimester — can be significantly worsened by low iron levels.
Women over 35 may be more likely than younger women to enter pregnancy with lower iron stores, particularly if they have had heavy periods or dietary patterns low in iron-rich foods. Most prenatal vitamins contain iron, but the amount varies, and your healthcare provider may recommend additional supplementation if blood tests indicate deficiency. Good dietary sources of iron include lean red meat, poultry, fish, legumes, tofu, and leafy greens. Consuming vitamin C-rich foods alongside iron-rich foods may support absorption. For context on managing energy and fatigue in pregnancy, our article on first trimester fatigue after 35 discusses the role of iron in more detail.
Calcium and Vitamin D
Calcium is essential for fetal bone development and is drawn preferentially from the mother’s stores if dietary intake is insufficient. While severe calcium deficiency is uncommon in well-nourished populations, ensuring adequate intake throughout pregnancy supports both maternal bone health and fetal skeletal development.
Vitamin D works alongside calcium in bone metabolism and has been studied in the context of a range of pregnancy outcomes, including gestational diabetes and preeclampsia risk, though research is ongoing and findings are still being evaluated. Vitamin D deficiency is relatively common in many populations, and pregnancy increases vitamin D needs. Your healthcare provider can assess your vitamin D levels through a blood test and recommend appropriate supplementation if needed.
Dairy and Non-Dairy Sources
Dairy products are among the most concentrated dietary sources of calcium, but adequate intake is also achievable through non-dairy sources including fortified plant milks, tofu made with calcium sulfate, almonds, broccoli, and canned fish with bones. If dietary calcium is consistently low, supplementation may be discussed with your provider.
Omega-3 Fatty Acids
Docosahexaenoic acid (DHA) — a long-chain omega-3 fatty acid — is an important structural component of the developing brain and retina. Research consistently supports adequate DHA intake during pregnancy for fetal neurological development. Fatty fish (such as salmon, sardines, and mackerel) are the richest dietary sources, though concerns about mercury in some fish are relevant during pregnancy.
Current guidance from health organizations including ACOG and the FDA recommends that pregnant women eat 8–12 ounces of low-mercury fish per week while avoiding high-mercury species like shark, swordfish, king mackerel, and bigeye tuna. For women who do not eat fish regularly, DHA supplements derived from algae (the original source from which fish obtain DHA) are an evidence-supported alternative. For a broader discussion of pregnancy health considerations, our overview of pregnancy after 35 covers what to expect throughout the trimesters.
Choline
Choline is a nutrient that has received increasing research attention for its role in fetal brain development and neural tube closure, similar in some respects to folate. Despite its importance, choline is often underrepresented in prenatal vitamins, and research suggests that many pregnant women do not meet recommended intake levels.
Good dietary sources of choline include eggs (particularly the yolk), lean meats, fish, soybeans, and certain vegetables. If your prenatal vitamin does not contain choline, discussing whether supplementation is appropriate with your healthcare provider is worthwhile.
Iodine
Iodine plays a critical role in thyroid hormone production, which in turn influences fetal brain development — particularly in early pregnancy before the fetal thyroid is functional. Iodine requirements increase during pregnancy, and deficiency during this period has been associated with impaired cognitive development in offspring in research from iodine-deficient populations.
In many countries, iodized salt and dairy products are the primary dietary iodine sources. Some prenatal vitamins include iodine; others do not. Checking the label of your prenatal supplement and discussing iodine intake with your healthcare provider is a reasonable step, particularly if you use non-iodized salt or follow a restricted diet.
💊 Related Product Guide
For a research-informed look at prenatal supplement options, our guide to prenatal vitamins after 35 covers what current evidence supports for folate, iron, vitamin D, and DHA — with context on what to look for when choosing a supplement.
Frequently Asked Questions
Should I take a prenatal vitamin even if I eat a balanced diet?
Most obstetric guidelines recommend prenatal vitamins for all pregnant women, as it can be difficult to consistently meet all increased nutrient needs through diet alone, particularly in the first trimester when nausea may limit food variety. A prenatal vitamin is generally considered a complement to — not a replacement for — a nutritious diet. Your healthcare provider can recommend a specific formulation appropriate for your needs.
Are there foods I should avoid during pregnancy after 35?
Standard pregnancy dietary guidance applies across maternal ages and includes avoiding raw or undercooked meats and fish, unpasteurized dairy products, high-mercury fish, and limiting alcohol. Your healthcare provider or a registered dietitian can offer personalized guidance based on your health situation and dietary patterns.
Do nutrient needs change significantly after 35 compared to younger pregnancies?
The core nutritional requirements of pregnancy are broadly consistent across maternal age groups. However, women over 35 may be more likely to have specific nutritional considerations — such as lower iron stores, greater vitamin D deficiency risk, or thyroid-related concerns — that make personalized assessment by a healthcare provider particularly valuable.
Key Takeaways
- Folate/folic acid, iron, calcium, vitamin D, omega-3s (particularly DHA), choline, and iodine are among the key nutrients to prioritize during pregnancy.
- Most prenatal vitamins cover many but not all of these nutrients — checking the formulation and discussing gaps with your healthcare provider is worthwhile.
- Women over 35 may be more likely to have specific nutritional starting points (such as lower iron stores or vitamin D levels) that benefit from individualized assessment.
- Dietary patterns matter alongside supplements — a varied diet rich in whole foods provides nutrients in forms the body can use well.
- A registered dietitian or obstetric provider can offer personalized nutritional guidance appropriate to your health history and pregnancy circumstances.
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.