Which foods should I avoid completely during pregnancy?
A short list of foods carries a clear enough risk in pregnancy that most guidance says avoid them outright: unpasteurized dairy and juice, raw or undercooked meat, poultry and eggs, raw sprouts, high-mercury fish like shark, swordfish, king mackerel and tilefish, and unheated deli meats or pâté. These foods are linked to specific infections — listeria, salmonella, toxoplasmosis — or to mercury levels that can affect a developing nervous system. The list looks long, but in practice it means checking labels, cooking meat and eggs through, and being a little more careful about deli counters and sushi bars than you were before.
This is a different category from foods you simply moderate, like caffeine or added sugar — these are foods where guidance leans toward avoiding them altogether rather than setting a safe amount. That said, one meal made with unpasteurized cheese or one lukewarm deli sandwich is not a reason to assume harm. Most people who eat something on this list, once or occasionally, go on to have straightforward pregnancies, because actual infection requires the food to be contaminated as well as eaten. The point of the list is to lower an already small risk further, not to suggest that every slip carries a guaranteed consequence.
Which fish are safe to eat, and which should I limit or avoid?
Fish naturally low in mercury — like salmon, shrimp, tilapia, cod and canned light tuna — are considered fine to eat regularly during pregnancy, while a small group of long-lived predatory fish, including shark, swordfish, king mackerel and tilefish, are best avoided because they accumulate much higher mercury levels. Mercury crosses the placenta and can affect a developing brain and nervous system, which is why the guidance separates fish by species rather than telling you to avoid fish altogether. Albacore, or white tuna, sits in the middle and is usually recommended in smaller amounts than light tuna.
Fish also supplies omega-3 fats that support your baby's brain and eye development, which is part of why the advice is about choosing wisely rather than cutting fish out. If you are unsure about a specific type — from the supermarket counter or a restaurant menu — asking is a reasonable habit, since names and local varieties vary. Raw or undercooked fish, including in sushi, sits in a different category again, covered below, because the concern there is more about bacteria and parasites than mercury. Canned and cooked fish, from low-mercury species, can typically be part of a normal weekly diet.
Why are deli meats and soft cheeses a listeria concern?
Deli meats, hot dogs, refrigerated pâté, and soft cheeses made from unpasteurized milk — like some brie, camembert, feta, and blue-veined cheeses — can carry listeria, a bacterium that survives refrigeration and can cause a serious infection called listeriosis. Pregnancy changes how your immune system responds to some infections, which is part of why guidance is more cautious here than it would be for someone who isn't pregnant. Heating deli meats and hot dogs until steaming hot, and choosing cheeses clearly labelled as made with pasteurized milk, largely removes the concern without asking you to give up these foods entirely.
Listeriosis can look like a mild flu at first — fever, chills, muscle aches, sometimes nausea or diarrhoea — and symptoms can appear anywhere from a few days to a few weeks after eating contaminated food, which makes it easy to miss the connection. Call your midwife or doctor the same day if you develop a fever along with these symptoms, particularly if you know you have recently eaten deli meat, unpasteurized cheese, or refrigerated pâté. It is treatable with antibiotics, and catching it early matters, so this is one of the few food-related symptoms worth acting on quickly rather than waiting to see if it passes.
Is it safe to eat raw or undercooked eggs, meat, and sushi?
Raw or undercooked eggs, meat and poultry carry a higher risk of salmonella and, with undercooked meat particularly, toxoplasmosis, both of which are worth avoiding by cooking food through rather than serving it rare or runny. Sushi made with raw fish is generally grouped into the same category and is often advised against, though sushi made with fully cooked fish, vegetables, or fillings like avocado and cucumber isn't included in that caution. Runny yolks, homemade mayonnaise or dressings made with raw egg, and rare steak or burgers are the most common everyday sources people don't think to check.
Toxoplasmosis is usually mild or symptomless in adults but can affect a developing baby if picked up for the first time during pregnancy, which is why undercooked meat and unwashed produce both get specific mentions rather than one blanket rule. Using a food thermometer is more reliable than judging meat by colour alone, since a burger can look done on the outside and still be undercooked in the middle. If you do eat something undercooked once, that alone isn't a diagnosis of anything — most exposures don't lead to infection, and watching for symptoms rather than assuming the worst is the more useful response.
What about unwashed produce, raw sprouts, and unpasteurized juice?
Raw sprouts — alfalfa, clover, radish and mung bean among them — are usually advised against because the warm, humid conditions needed to grow them are also ideal for bacteria like salmonella and E. coli, and washing doesn't reliably remove it once it's inside the seed. Unpasteurized, or raw, milk and juice carry a similar caution, since pasteurization is specifically the step that kills the bacteria of concern, and skipping it removes that safety margin. Cooking sprouts thoroughly, and checking juice and cider labels for the word pasteurized, covers most of what this category is really asking of you.
Ordinary fruit and vegetables are a different story — the advice there is to wash them well before eating, not to avoid them, since produce is a valuable part of a pregnancy diet rather than a risk to manage around. Washing under running water, and scrubbing anything with a firm skin, removes most surface bacteria and residue. A salad at a restaurant or a piece of fruit you didn't wash yourself is not a reason for alarm; it's the raw sprouts, unpasteurized dairy and juice specifically that carry the clearer, avoidable risk, rather than fresh produce in general.
What symptoms after eating something risky mean I should call my provider?
Fever, chills, muscle aches, severe or persistent vomiting or diarrhoea, or reduced movement from your baby are the main symptoms worth calling your midwife or doctor about the same day, especially if they follow a meal you're now unsure about. These can point to listeriosis, salmonella, or another foodborne infection that is more meaningful to catch early in pregnancy than it would be otherwise. Most single instances of nausea or an upset stomach are not this, and pregnancy itself causes plenty of stomach upset on its own.
You do not need to work out for yourself whether a symptom is serious before calling — describing what you ate and how you're feeling is enough for your provider to take it from there. Many calls like this end with reassurance rather than treatment, and that is a completely reasonable reason to have made the call. If in doubt, treat a same-day call as the default rather than something to save for when symptoms are severe, particularly with fever or muscle aches following one of the higher-risk foods above.