Can I eat yogurt while pregnant?

The verdict

Yes. Yoghurt is one of the few foods the NHS names explicitly in the safe-to-eat column rather than leaving unmentioned: any pasteurised milk, butter, yoghurt, cream and ice cream, including cows', sheep's and goats' milk versions.

The only version on the avoid list is unpasteurised yoghurt, and it sits there alongside unpasteurised milk, cream, butter and ice cream.

In practice, essentially all yoghurt sold in UK, Irish, Australian and US supermarkets is made from pasteurised milk. This is a question with a reassuring answer and a short list of exceptions.

What pasteurisation does, and what live cultures do not undo

This is where most of the confusion sits, so it is worth being precise.

Yoghurt is made by pasteurising milk first and then deliberately adding bacterial cultures - typically Lactobacillus bulgaricus and Streptococcus thermophilus - which ferment the lactose into lactic acid and thicken the milk. The pasteurisation step comes before the cultures, not instead of them.

So live yoghurt, bio yoghurt and probiotic yoghurt are all made from pasteurised milk. The word live refers to the added cultures being viable, not to the milk being raw. Those cultures are not pathogens and they are not what pregnancy guidance is concerned with.

Unpasteurised yoghurt means yoghurt made from raw milk, which is rare and usually sold at farm gates and farmers' markets rather than in supermarkets. That is the product on the avoid list, and the reason is the raw milk, which can carry listeria, salmonella, E. coli and campylobacter.

The acid is not a defence

People sometimes assume that yoghurt's acidity makes raw milk safe. It does not reliably. Listeria in particular tolerates acid conditions better than most foodborne bacteria, and it also grows at refrigeration temperatures, which is exactly the combination a yoghurt provides.

The NHS reason for restricting unpasteurised dairy in pregnancy is listeriosis, which it states can cause miscarriage or stillbirth, or make a newborn baby seriously unwell.

The varieties, worked through

• Greek and Greek-style yoghurt. Strained yoghurt. Pasteurised, safe, and higher in protein for the same volume.
• Skyr. An Icelandic strained product, pasteurised, safe.
• Natural, set and plain yoghurt. Safe.
• Fruit and flavoured yoghurts. Safe. The consideration is sugar rather than safety - many are substantial contributors to the 30g daily free sugar reference intake. NHS pregnancy advice suggests low-fat, lower-sugar fruit yoghurt or plain yoghurt with fruit as a healthy snack.
• Goats' and sheep's milk yoghurt. Safe if pasteurised, and the NHS names those milks specifically.
• Plant-based yoghurts. Soya, coconut, oat and almond yoghurts are not dairy and carry no pasteurisation question. Check they are fortified with calcium if you are using them to replace dairy.
• Frozen yoghurt. Packaged frozen yoghurt is fine. Dispensed from a soft-serve machine, it inherits the soft-serve question, which Ireland and Australia answer restrictively.
• Yoghurt from a farm shop or market stall. This is the one to ask about. If it is made from raw milk, it is on the avoid list.

Why yoghurt is worth eating

ACOG names milk and other dairy products, including cheese and yogurt, as the best sources of calcium in pregnancy. safefood in Ireland recommends three servings of dairy a day and lists yoghurt among them.

Yoghurt is also a practical protein source at a time when appetite can be unreliable. NHS pregnancy advice is to eat some protein-rich food every day, and plain yoghurt with fruit is on its list of healthy pregnancy snacks.

One caution about pairing. If you are taking iron tablets or trying to raise your iron from food, the NHS notes that milk and dairy make it harder for your body to absorb iron. That is an argument for spacing yoghurt away from your iron-rich meal, not for avoiding it.

Storage, which is the part that actually goes wrong

Yoghurt is a chilled ready-to-eat food and the ordinary rules apply. Keep it refrigerated, observe the use-by date, and once opened use it within a couple of days - safefood's guidance for opened packets is two days, and the HSE says the same about leftovers.

Yoghurt left out at room temperature for an afternoon, or a tub that has had a spoon in and out of it for a week, is a different proposition from a sealed pot in date. FSANZ's precaution for pasteurised dairy is to store it in the fridge and limit time spent in the 5 to 60 degree danger zone when serving.

Yoghurt-based dips such as tzatziki and raita follow the same logic, with one extra consideration: any raw vegetable stirred in should have been washed thoroughly first, and a deli-counter dip is a ready-to-eat food from a delicatessen, which safefood lists among items to avoid.

If you have already eaten unpasteurised yoghurt

Very likely nothing follows. The NHS position on foods that should have been avoided is that a small amount is unlikely to affect your baby if you did not become ill. There is no test based on exposure alone.

Watch the following days and weeks for a flu-like illness with a high temperature, aches and chills, or for vomiting and diarrhoea. Listeriosis can appear well after the meal. NHS advice is to get help from 111 if you feel unwell after having food or drink that should be avoided in pregnancy. Say you are pregnant and that you ate raw milk yoghurt.

Where guidance differs

It does not, which is unusual on this site. The UK, Ireland, Australia and the United States all draw the same line in the same place: pasteurised dairy yes, unpasteurised dairy no.

The only variation is in how positively each frames it. The NHS and ACOG both actively encourage yoghurt, ACOG as a calcium source and the NHS as a healthy snack. safefood puts a number on it with three dairy servings a day. FSANZ frames it defensively, restricting raw dairy rather than recommending yoghurt.

None of them treats live cultures, Greek strain or probiotic content as a reason for caution, and no country asks pregnant women to avoid fermented dairy as a category.