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Foods to Avoid During Pregnancy: 4 Main Categories

• Tim Kelas Antenatal & Postnatal
nutrition pregnancy maternal-health

The short answer: during pregnancy, avoid raw seafood, high-mercury fish, undercooked eggs and soft cheeses, and more than 200mg of caffeine a day — because a pregnant woman’s immune system is weaker and the risk of food poisoning is higher.

A pregnant woman’s immune system is weaker than usual. Food should be cooked thoroughly to avoid acute food poisoning infections such as Salmonella, Listeria, and E. coli.

1. Raw Seafood (Sushi & Oysters)

Raw seafood can contain water-borne parasites and bacteria. Always choose fish or seafood that is fully steamed or fried.

2. High-Mercury Fish

Fish such as shark, marlin, swordfish, and king mackerel contain high levels of the mercury neurotoxin. This mercury can affect the baby’s nerves and brain development.

3. Undercooked Eggs and Soft Cheeses

  • Undercooked eggs (runny eggs) can carry Salmonella bacteria.
  • Soft cheeses such as Feta, Brie, and Camembert may contain the Listeria pathogen.

Make sure any eggs and cheeses you eat are fully cooked and safely processed.

4. Caffeine Over the Limit

Limit coffee to an average maximum of 200mg per day (around 1–2 small cups). Caffeine crosses the placenta and can affect the baby’s heart function and birth weight. Smart food choices are also essential for mothers diagnosed with gestational diabetes (GDM), where carbohydrate control is the foundation of management.

When to See a Doctor

If you experience signs of food poisoning after eating a risky food, seek medical advice right away — don’t wait for the symptoms to get worse. For context on how diet affects blood pressure in pregnancy, also read about pre-eclampsia and its warning signs. Make sure you understand the right supplements to take to cover your daily nutrient needs.

This article is for educational purposes and is not medical advice. Always consult your doctor or midwife.

Frequently Asked Questions

Why should pregnant women avoid raw seafood?

Raw seafood such as sushi and oysters can contain water-borne parasites and bacteria. Always eat fish or seafood that is fully steamed or fried, because a pregnant woman's immune system is weaker.

Which fish should be avoided during pregnancy?

Fish in the high-mercury category, such as shark, marlin, swordfish and king mackerel. The mercury neurotoxin can affect the baby's nerves and brain development.

Why are undercooked eggs and soft cheeses dangerous for pregnant women?

Undercooked eggs (runny eggs) can carry Salmonella bacteria, while soft cheeses such as Feta, Brie and Camembert may contain the Listeria pathogen — both can cause acute food poisoning.

How much caffeine is allowed during pregnancy?

Limit coffee intake to an average maximum of 200mg per day, which is around 1 to 2 small cups. Caffeine crosses the placenta and can affect the baby's heart function and birth weight.