Eating Well in Pregnancy

The advice around eating in pregnancy can feel overwhelming: lists of foods to avoid, specific nutrients to prioritise, supplements to take, and a general sense that the stakes are very high. The reality is that most people's bodies do a remarkable job of meeting a growing baby's needs even when diet is far from ideal. That said, there are some things that genuinely matter, some things that are worth knowing about, and some things that probably don't require the level of concern they sometimes attract.

Pregnancy is not the time for dietary restriction or calorie counting. The aim is nourishing food, eaten in adequate quantities, with appropriate supplements where needed, and as little stress about the rest as possible.

The supplements that matter

Folic acid is the most important supplement to take from as early as possible in pregnancy, ideally from before conception, and continuing until at least week 12. It significantly reduces the risk of neural tube defects. The standard dose is 400 micrograms; those with certain risk factors may be advised to take 5mg daily, which your midwife or GP can advise on.

Vitamin D is recommended at 10 micrograms daily throughout pregnancy and breastfeeding in the UK, given the limited sunlight available in our climate for much of the year. It supports bone development in the baby and immune function in the mother.

Iron requirements increase during pregnancy. Many people find their iron levels drop during the second and third trimesters as blood volume expands. Iron-rich foods (red meat, lentils, spinach, fortified cereals) alongside vitamin C to aid absorption are the dietary approach; supplementation may be needed if levels fall significantly, and your midwife will check this via routine blood tests.

"Eating in pregnancy is about nourishment rather than perfection. Getting a wide range of foods, staying hydrated, and not going hungry are the most important things."

Foods to approach carefully

There are certain foods that carry a risk of foodborne illness that is particularly relevant in pregnancy, where the immune system is suppressed and any infection can have consequences for the baby. Raw or undercooked meat and fish, including sushi and rare steak, are best avoided. Unpasteurised dairy and soft mould-ripened cheeses such as brie and camembert carry a listeria risk. Raw or undercooked eggs from non-British-Lion-stamped sources should be avoided, though British Lion eggs are now considered safe to eat runny. High-mercury fish, including shark, swordfish, and marlin, should be avoided; tuna is safe in limited quantities.

Liver and liver products are very high in vitamin A and should be avoided in pregnancy, as excessive vitamin A can affect foetal development. Caffeine should be limited to around 200mg per day, equivalent to one to two cups of coffee, as higher intake is associated with increased miscarriage risk. Alcohol is generally advised to be avoided throughout pregnancy given the absence of any established safe level.

What to include more of

Protein needs increase in pregnancy and can be met through meat, fish, eggs, dairy, legumes, tofu, and nuts. Calcium is important for bone development and is found in dairy products, fortified plant milks, leafy greens, and tinned fish with bones. Omega-3 fatty acids from oily fish support brain development; two portions of oily fish a week is a reasonable aim, within the mercury guidance above. Fibre-rich foods, plenty of water, and regular small meals help manage the constipation and indigestion that pregnancy often brings.

The best approach to pregnancy nutrition is one that's sustainable and doesn't add to the list of things to worry about. Eating a good variety of whole foods, taking your supplements, and being sensible about the specifics is enough.