Here's a number that stopped me when I first read it: over 90% of pregnant individuals may not be getting adequate iron, vitamin D, or vitamin E from food alone.
That's not a fringe statistic. It comes from recent research examining large populations of pregnant women — and it tracks with what I see in my practice every single day. Pregnancy has clear, well-documented nutritional requirements. And most people, despite genuinely trying, aren't meeting them.
I'm Tuğba — a registered dietitian who works with pregnant clients across Turkey and the Netherlands. And I want to talk honestly about what the nutritional needs of pregnancy actually look like, what's changed in the latest dietary guidelines, and what you can do about the gaps.
Why Pregnancy Nutrition Is Harder Than It Looks
Before we get into specifics, let me acknowledge something: eating well during pregnancy is genuinely difficult.
First trimester nausea can make the smell of cooking vegetables unbearable. Heartburn in the second trimester limits what you can comfortably eat. The sheer exhaustion of growing another human being isn't exactly conducive to enthusiastic meal planning. And on top of that, you're bombarded with conflicting advice from every direction.
Add to that the fact that pregnancy significantly increases your nutritional requirements at a time when your food tolerance may be decreased, and you have a recipe for gaps.
This is not a moral failure. It's a physiological reality. The question is what to do about it.
The Critical Nutrients Most Pregnant Women Are Missing
Iron: The Big One
Iron deficiency is the most common nutritional deficiency in pregnancy worldwide. The reasons are straightforward: your blood volume increases by roughly 40–50% during pregnancy, which means your iron requirements spike dramatically (from around 18mg/day pre-pregnancy to 27mg/day during pregnancy).
Iron deficiency during pregnancy has real consequences: fatigue, impaired immune function, increased risk of preterm birth and low birth weight, and impacts on the baby's cognitive development and iron stores at birth.
What helps: Eating iron-rich foods regularly — red meat, poultry, fish, lentils, chickpeas, tofu, dark leafy greens (spinach, kale), fortified cereals. Crucially, pairing iron-rich plant foods with vitamin C sources dramatically improves absorption. A squeeze of lemon on your lentil soup, bell peppers alongside your spinach salad — these small additions matter.
What hinders: Calcium and iron compete for absorption. Avoid taking your iron supplement at the same time as calcium supplements or dairy-heavy meals. Tea and coffee (tannins) also reduce iron absorption — wait at least an hour after eating before drinking them.
Most prenatal supplements contain iron, but whether the dose is adequate depends on your individual levels — this is something worth testing and discussing with your doctor or dietitian.
Vitamin D: The Silent Deficiency
Vitamin D deficiency is extraordinarily common in the general population — and it's even more prevalent among pregnant women, particularly those living in northern latitudes (hello, Netherlands), women with darker skin tones, and those who spend limited time outdoors.
During pregnancy, adequate vitamin D is essential for fetal bone development, immune function, and may play a role in reducing the risk of gestational complications. Yet most dietary sources are limited: fatty fish, egg yolks, and fortified foods provide some, but rarely enough.
What to do: Most pregnant women benefit from vitamin D supplementation. Standard recommendations vary by country (in the Netherlands, 10 mcg/day is advised; in Turkey, guidance depends on sun exposure), but many experts now suggest that optimal levels during pregnancy require more than the minimum supplement recommendations. Getting your vitamin D levels tested early in pregnancy, and again later, is worthwhile.
Folate: The One You've Heard Of (But Might Not Be Getting Right)
Folate (or folic acid in its supplement form) is essential for neural tube development in the earliest weeks of pregnancy — often before many women even know they're pregnant. This is why starting supplementation before conception is so important.
The standard advice to take 400–800 mcg of folic acid daily before and during early pregnancy is well-established. But there's nuance here: some women have genetic variants (like MTHFR polymorphisms) that affect how they metabolize folic acid, making methylfolate (the active form) a better option. This isn't something to self-diagnose, but worth discussing with a healthcare provider if you have a family history of neural tube defects.
Dietary folate sources include dark leafy greens, legumes, avocado, asparagus, and fortified grains.
Omega-3 Fatty Acids (DHA): Critical for Brain Development
DHA (docosahexaenoic acid) is a long-chain omega-3 fatty acid that accumulates in the fetal brain and eyes during the third trimester. Adequate DHA intake during pregnancy is associated with better cognitive and visual development outcomes in children.
The main dietary sources are fatty fish: salmon, sardines, mackerel, herring, anchovies. The challenge: pregnancy guidelines recommend limiting high-mercury fish (shark, swordfish, king mackerel, tilefish) due to mercury's neurotoxic effects on fetal development. This creates some confusion about fish consumption.
The balance: Fatty fish that are lower in mercury (salmon, sardines, anchovies, trout) are excellent choices and should be eaten 2–3 times per week. If fish isn't a regular part of your diet, an algae-based DHA supplement (which is where fish get their DHA from in the first place) is an excellent alternative — and fully vegan.
The 2026 Dietary Guidelines Update: What Changed?
In January 2026, updated dietary guidelines were released by the HHS and USDA with specific sections for pregnant and lactating women. The key emphasis points:
- Prioritize protein at every meal. Not just in general — at every meal. This supports fetal growth, maternal tissue development, and helps manage gestational weight gain.
- Full-fat dairy without added sugars. A shift from earlier low-fat recommendations, reflecting updated understanding of the role of dairy fat in satiety and nutrient absorption.
- Whole fruits and vegetables over juices. Fiber retention matters during pregnancy for digestive health (hello, pregnancy constipation) and blood sugar management.
- Whole grains with reduced refined carbohydrates. Particularly relevant for managing gestational diabetes risk and supporting healthy weight gain.
- Limiting highly processed foods and added sugars. Nothing surprising, but worth reinforcing.
Gestational Weight Gain: The Uncomfortable Truth
Research shows that nearly 50% of pregnant women in the United States gain more weight than recommended during pregnancy. This is a significant trend because excess gestational weight gain increases the risk of cesarean delivery, gestational diabetes, postpartum weight retention, and metabolic complications for both mother and baby.
I want to say this carefully: this is not about restriction or body image pressures during pregnancy. It's about health outcomes. Gaining an appropriate amount of weight during pregnancy — based on your starting weight and your specific circumstances — is genuinely important.
The ranges, per general guidelines:
- Normal starting weight: 11.5–16 kg total gain
- Overweight starting weight: 7–11.5 kg
- Obese starting weight: 5–9 kg
- Underweight starting weight: 12.5–18 kg
But these are ranges, not rules. Individual variation matters enormously, and the quality of the diet is as important as the total quantity gained.
Practical Daily Nutrition for Pregnancy
Here's what I suggest to clients as a starting framework — not a rigid meal plan, but a structure to build from:
Breakfast: Include protein (eggs, yogurt, nut butter) + complex carbs (oatmeal, whole grain toast) + fruit. This stabilizes blood sugar through the morning and helps with nausea management.
Lunch: A varied plate — protein source, cooked vegetables, whole grains, and healthy fat (olive oil, avocado). Try to include legumes several times a week.
Afternoon snack: Especially important in pregnancy. Something that combines protein and carbs — yogurt with fruit, a small handful of nuts and dates, hummus with vegetables and crackers.
Dinner: Fatty fish 2–3 times a week is an excellent goal. Other evenings, poultry, legumes, or eggs. Always include vegetables.
Daily hydration goal: 2–2.5 liters of water (including herbal teas, soups, and water-rich foods).
Supplements: At minimum: a quality prenatal multivitamin, additional vitamin D (dose based on your levels), and DHA if your fish consumption is limited.
A Note on Nausea, Food Aversions, and First Trimester Reality
I want to acknowledge this honestly: if you're in the first trimester dealing with severe nausea, some of this guidance will feel impossible. That's okay.
In the first trimester, the priority is calories from whatever you can tolerate. Crackers, plain toast, cold foods (often better tolerated than hot), small frequent meals instead of three large ones, and ginger-based foods or teas for nausea management.
The time to really build nutrition quality is generally the second trimester, when most women have more food tolerance. If severe nausea persists, working with a dietitian who understands pregnancy nutrition can make a real difference.
Ready to build a pregnancy nutrition plan that supports you and your baby? [Book a consultation with HANZI Nutrition →]
Written by Dyt. Tuğba Kaslıoğlu Yürik — Registered Dietitian & Founder of HANZI Nutrition and Diet Counseling Center. Specializing in pregnancy and maternal nutrition. Based in Tilburg, Netherlands and Antalya, Turkey.
