Walnuts, almonds, pistachios, hazelnuts, and peanuts are all excellent choices during pregnancy. They supply folate, healthy fats, and minerals that support both your health and your baby’s development. A Spanish study of over 2,200 mother-child pairs found that eating roughly three small (30-gram) servings of nuts per week during the first trimester was linked to better cognitive outcomes in children years later.
Why Nuts Matter During Pregnancy
Nuts pack an unusually dense combination of nutrients that align with what pregnancy demands. They’re rich in folate, which helps prevent neural tube defects in early development. They provide omega-3 and omega-6 fatty acids, which are essential building blocks for your baby’s brain and nervous system. And they deliver fiber, vitamin E, magnesium, and potassium, all nutrients that become harder to get enough of as your caloric needs shift.
What makes nuts particularly useful is that they’re portable, shelf-stable, and easy to eat when nausea makes larger meals unappealing. A small handful gives you a meaningful dose of several key nutrients at once.
Best Nuts for Brain Development
The omega-3 and omega-6 fatty acids in nuts tend to accumulate in neural tissue, particularly in the frontal areas of the fetal brain. These are the regions that later govern memory, attention, and executive function. Research from the Barcelona Institute for Global Health (ISGlobal) tracked children whose mothers ate nuts during the first trimester and found that those in the highest-consumption group scored better on tests of cognitive function, attention capacity, and working memory.
The weekly amount linked to those benefits was modest: just under three 30-gram servings, which works out to roughly a small handful most days. The study included walnuts, almonds, peanuts, pine nuts, and hazelnuts. Walnuts stand out in this group because they contain more plant-based omega-3 (alpha-linolenic acid) than any other common nut, making them especially relevant for fetal brain support.
Almonds for Blood Pressure and Heart Health
Almonds are rich in monounsaturated fats, magnesium, potassium, vitamin E, and fiber. This combination makes them particularly helpful for cardiovascular health during pregnancy, a time when blood volume increases dramatically and blood pressure regulation becomes critical. Persistently abnormal blood pressure and lipid levels during pregnancy raise the risk of preeclampsia, gestational diabetes, fetal growth restriction, and preterm birth.
Clinical research has shown that daily almond supplementation improves both blood pressure and lipid profiles in pregnant women dealing with hypertension and abnormal cholesterol. The magnesium in almonds plays a direct role here: it helps relax blood vessel walls, which lowers pressure. A single ounce of almonds provides about 75 milligrams of magnesium, roughly 20% of a pregnant woman’s daily target.
A Nut-by-Nut Breakdown
- Walnuts: Highest plant-based omega-3 content of any nut. Best choice specifically for supporting fetal brain and nervous system development.
- Almonds: High in magnesium, calcium, vitamin E, and fiber. Particularly helpful for blood pressure management and bone support.
- Pistachios: Good source of protein, potassium, and vitamin B6, which helps with nausea and supports your baby’s brain development. Also rich in antioxidants.
- Hazelnuts: Strong in folate and vitamin E. A good option for meeting your increased folate needs in the first trimester.
- Peanuts: Technically a legume, but nutritionally similar. High in protein and folate, widely available, and affordable. One of the most studied nuts in pregnancy research.
- Pine nuts: Provide iron and magnesium, though they’re typically eaten in smaller quantities than other nuts.
You don’t need to pick just one. Eating a variety gives you the broadest range of nutrients, since each nut has a slightly different profile.
Raw vs. Roasted: What to Choose
Both raw and roasted nuts are nutritious, but there are a few differences worth knowing about. Roasting removes some of the antioxidant-rich skin, which can reduce certain protective compounds. A 2022 Cornell study found that roasted pistachios had more vitamin E, while raw pistachios had more carotenoids (a different type of antioxidant). The differences are real but not dramatic.
The bigger concern with roasted nuts is sodium. Plain raw nuts contain zero milligrams of sodium, but a single ounce of salted roasted nuts can pack 300 to 400 milligrams. During pregnancy, excess sodium contributes to fluid retention and can worsen blood pressure problems. Flavored varieties (think wasabi, soy sauce, or honey-roasted) tend to be even higher in sodium and added sugar. Your best bet is unsalted or lightly salted options, ideally under 75 milligrams of sodium per serving. Dry-roasted and unsalted is a good middle ground if you prefer the taste of roasted nuts.
How Much to Eat
The research linking nuts to better child neurodevelopment used a benchmark of about three 30-gram servings per week. That’s roughly a small handful (about 20 to 25 almonds, or 14 walnut halves) on most days. This is a comfortable amount that fits easily into meals or snacks without adding excessive calories.
Nuts are calorie-dense, averaging around 160 to 200 calories per ounce, so portion awareness helps. But during pregnancy your caloric needs increase anyway, and those calories come bundled with fiber, protein, and healthy fat that keep you full longer than refined snacks. Tossing a handful into oatmeal, yogurt, or a salad is one of the simplest upgrades you can make to your prenatal diet.
Do Nuts During Pregnancy Cause Allergies in Children?
This is one of the most common concerns, and the short answer is no. Older guidance used to recommend that pregnant women avoid peanuts and tree nuts to reduce the risk of childhood allergies, but that advice has been reversed. The USDA’s 2020 Dietary Guidelines Advisory Committee reviewed the available evidence and found no basis for restricting nuts during pregnancy or breastfeeding. For every allergy-related outcome they examined, including food allergies, eczema, allergic rhinitis, and asthma, the committee found either no evidence or insufficient evidence that maternal nut consumption increased risk.
Current guidelines do not recommend avoiding any specific foods during pregnancy for allergy prevention purposes. If you have a personal nut allergy, of course, continue to avoid those nuts. But if you can eat them safely, there’s no reason to skip them out of concern for your baby’s allergy risk.