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Healthy Diet in Pregnancy: Complete NHS Guide

A healthy pregnancy diet is much simpler than the internet often makes it sound: it's a varied, balanced diet, with a small number of specific foods to avoid and two supplements the NHS recommends for almost everyone. You don't need to overhaul everything you eat overnight — small, steady adjustments are enough to support your baby's growth.

The building blocks of a balanced plate

The NHS "Eatwell Guide" principles apply just as much in pregnancy as at any other time, with a few pregnancy-specific additions.

  • Fruit and vegetables — aim for at least five portions a day, fresh, frozen, tinned or dried, for fibre, vitamins and minerals.
  • Starchy carbohydrates — wholegrain bread, rice, pasta, potatoes or cereals at most meals, ideally choosing wholegrain versions where you can for extra fibre.
  • Protein — lean meat, poultry, fish, eggs, beans, lentils and pulses, aiming for at least two portions of fish a week, one of which should be oily (such as salmon or mackerel).
  • Dairy or fortified alternatives — milk, cheese and yoghurt (or calcium-fortified plant alternatives) provide calcium, which is important for your baby's developing bones.
  • Fluids — water is the best choice; aim to stay well hydrated throughout the day, especially in hot weather or if you're being sick.

The two supplements almost everyone needs

Diet alone rarely provides enough of two specific nutrients, which is why the NHS recommends supplements alongside food, not instead of it.

  • Folic acid — 400 micrograms daily, ideally started before conception and continued until the end of week 12, to reduce the risk of neural tube defects such as spina bifida. Some people are advised a higher dose by their GP, depending on individual risk factors.
  • Vitamin D — 10 micrograms daily throughout pregnancy and breastfeeding, since it's hard to get enough from diet and UK sunlight alone, particularly over autumn and winter.
  • Both are widely available over the counter, and some people qualify for free vitamins through the NHS Healthy Start scheme.
  • Avoid vitamin A supplements or liver-based products (including liver pâté), as high vitamin A intake is linked to birth defects.

Foods to avoid or limit

A short list of foods carries a higher infection or contamination risk in pregnancy and is best avoided altogether, alongside a few things worth limiting.

  • Unpasteurised milk and soft mould-ripened or blue-veined cheeses (such as brie, camembert or gorgonzola) unless thoroughly cooked, due to listeria risk.
  • Raw or undercooked eggs unless produced under the British Lion Code of Practice, raw or undercooked meat, and pâté of any kind.
  • Certain fish should be limited due to mercury content, and swordfish, shark and marlin should be avoided altogether.
  • Limit caffeine to around 200mg a day (roughly two mugs of instant coffee), and avoid alcohol entirely — there's no known safe amount in pregnancy.
  • Raw shellfish and unwashed fruit and vegetables carry additional infection risks and should be avoided or washed thoroughly.

"Eating for two" is a myth

You don't need extra calories at all in the first trimester, and only around an extra 200 calories a day in the third trimester — roughly a slice of wholemeal toast with a scraping of spread, not a second dinner. Focus on the quality and variety of what you eat rather than the quantity, and don't diet or deliberately restrict food to control weight gain during pregnancy without your midwife's guidance.

Frequently Asked Questions

What should I eat every day during pregnancy?

Aim for a varied, balanced diet built around five portions of fruit and vegetables, wholegrain starchy foods, protein sources including fish twice a week, and dairy or fortified alternatives for calcium. Take a folic acid supplement (400mcg) until week 12 and a vitamin D supplement (10mcg) throughout pregnancy. There's no need to follow a special "pregnancy diet" beyond avoiding the specific higher-risk foods and staying well hydrated.

Do I need to eat more food once I'm pregnant?

No — this is one of the most persistent pregnancy myths. You don't need any extra calories in the first trimester, and only a small increase (around 200 calories a day, roughly a piece of toast) in the third trimester. What matters far more than quantity is eating a good variety of nutrient-rich foods and taking your recommended supplements.

Which foods should I avoid completely in pregnancy?

Avoid unpasteurised dairy and soft mould-ripened cheeses (unless cooked), pâté, raw or undercooked eggs and meat, swordfish, shark and marlin, and alcohol, all due to infection or contamination risks. Also avoid vitamin A supplements and liver products. If you're ever unsure about a specific food, your midwife, GP or pharmacist can give you a clear, personalised answer.

This article is for informational purposes only and does not constitute medical advice.

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