Pregnancy
Pregnancy Nutrition: What to Eat, What to Avoid, and Why
Good nutrition in pregnancy doesn't require a complicated diet. This evidence-based guide covers the key nutrients, foods to limit or avoid, and practical approaches for well-nourished pregnancies.
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This article is for general information and is not a substitute for professional medical advice. Always consult your pediatrician or doctor about your child.
Aligned with AAP, WHO, NHS and CDC guidance.
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Key Nutrients and Why They Matter
Pregnancy increases the body's requirements for several key nutrients. Understanding which ones matter most — and why — helps prioritise dietary choices without becoming overwhelmed.
Folate/Folic acid: Critical for neural tube development in the first 12 weeks. Found in leafy greens, legumes, and fortified foods. Supplementation (400mcg daily) is recommended alongside dietary sources because deficiency is common and consequences are serious.
Iron: Blood volume increases 50% in pregnancy, requiring significantly more iron. Red meat, beans, lentils, and fortified cereals are good sources. Iron absorption is enhanced by vitamin C and reduced by tea and coffee — simple pairing choices make a real difference. Iron deficiency anaemia affects approximately 20% of pregnancies and causes fatigue, dizziness, and reduced oxygen delivery.
Calcium and Vitamin D: Essential for fetal bone development. If calcium intake is insufficient, the body draws from maternal bones. Dairy, fortified plant milks, tinned sardines, and fortified foods provide calcium. Vitamin D — made primarily by sunlight on skin — is insufficient at most latitudes and supplementation is recommended.
Omega-3 DHA: Critical for fetal brain and retinal development. Found in oily fish, walnuts, and flaxseeds. DHA supplementation from algae-based sources is appropriate for vegetarians and vegans.
Foods to Avoid or Limit
The list of foods to avoid in pregnancy can feel overwhelming — but the underlying rationale is clear: reduce exposure to listeria, salmonella, toxoplasma, mercury, and alcohol.
- Raw or undercooked meat, poultry, and eggs: Risk of salmonella and toxoplasmosis
- Unpasteurised dairy and soft mould-ripened cheeses (brie, camembert, blue cheese): Risk of listeria
- Raw shellfish (oysters, mussels): Listeria and norovirus risk
- High-mercury fish (shark, swordfish, marlin): Mercury accumulates in the nervous system
- Alcohol: No safe level has been established — abstinence is recommended
- Liver and liver products: High vitamin A content can be harmful in large amounts
- Caffeine over 200mg/day: Associated with miscarriage risk and lower birth weight at higher doses
Practical Eating When Nausea Makes It Hard
For the approximately 80% of women who experience nausea in the first trimester, ideal nutrition recommendations are often impossible to follow. During this phase, the priority is eating whatever you can tolerate. Bland, carbohydrate-rich foods (crackers, toast, plain rice) are typically easiest to manage. Cold foods often have less odour than hot foods, which helps with nausea triggers. Small, frequent meals keep blood sugar stable. Ginger (in tea, biscuits, or capsule form) has modest but real evidence for nausea reduction. Vitamin B6 (pyridoxine) also has evidence for reducing pregnancy nausea and is safe to take. If nausea is severe or prevents adequate hydration, contact your GP — hyperemesis gravidarum requires medical treatment.
Frequently Asked Questions
Do I need to 'eat for two' in pregnancy?
No — this is one of the most persistent myths in pregnancy nutrition. The first trimester requires no additional calories. The second trimester needs approximately 340 extra calories per day, and the third trimester approximately 450 extra calories per day. These are modest increases — roughly equivalent to one extra snack. What matters more than calorie quantity is nutrient quality: getting adequate folate, iron, calcium, iodine, omega-3s, and vitamin D.
Which supplements are essential in pregnancy?
Folic acid (400mcg daily) from preconception through week 12 is essential to reduce neural tube defect risk — this is the most strongly evidence-based pregnancy supplement. Vitamin D (10mcg/400IU daily) is recommended throughout pregnancy and breastfeeding in most guidelines. Iodine is important and may be insufficient in many diets. Iron supplementation is recommended if iron-deficiency anaemia is confirmed by blood test. A pregnancy multivitamin can cover multiple needs but doesn't substitute for dietary quality.
Is it safe to eat fish in pregnancy?
Yes — fish is an excellent source of omega-3 fatty acids (DHA and EPA) which are important for fetal brain development. The guidance is to eat 2-3 portions of fish per week, including oily fish (salmon, sardines, mackerel, trout) but limiting oily fish to 2 portions per week due to mercury content. High-mercury fish to avoid: shark, swordfish, marlin, and raw shellfish. Well-cooked shellfish (prawns, mussels, crab) are safe. Canned tuna has lower mercury than fresh tuna.
Can I drink coffee during pregnancy?
Current guidelines recommend limiting caffeine to 200mg per day in pregnancy (equivalent to about 2 cups of instant coffee or 1 cup of filtered coffee). Higher caffeine intake is associated with increased risk of miscarriage and lower birth weight. Caffeine is also present in tea, cola, energy drinks, and chocolate. Many women find their tolerance for caffeine changes during pregnancy — morning sickness often makes coffee aversion an involuntary solution in the first trimester.
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