No single common food reliably “causes” a miscarriage the way a medication might. Most pregnancy losses result from chromosomal problems in the embryo, not from something the mother ate. But certain foods do carry bacteria, parasites, or toxins that raise the risk of miscarriage, stillbirth, or serious harm to a developing baby. Knowing which ones to avoid, and why, gives you practical control over one piece of a complicated picture.
Deli Meats, Hot Dogs, and Cold Cuts
Ready-to-eat refrigerated meats are one of the most common sources of Listeria, a bacterium that thrives at refrigerator temperatures. Listeria is especially dangerous during pregnancy because it can cross the placenta and infect the fetus even when the mother feels fine or has only mild, flu-like symptoms. Listeriosis during pregnancy is associated with miscarriage, stillbirth, and premature delivery.
The foods to watch include deli-sliced turkey, ham, roast beef, salami, and hot dogs straight from the package. If you want to eat them, heat them to an internal temperature of 165°F, or until they’re steaming hot. That temperature kills Listeria. Letting them cool again afterward reintroduces risk, so eat them while they’re still hot. Refrigerated pâtés and meat spreads fall into the same category.
Soft Cheeses and Unpasteurized Dairy
Raw (unpasteurized) milk can harbor Campylobacter, E. coli, Salmonella, Listeria, and even the bacterium that causes tuberculosis. Any cheese made from raw milk carries that same risk. The FDA specifically flags queso fresco, queso blanco, and requesón, whether made from pasteurized or unpasteurized milk, because their high moisture content supports bacterial growth.
Pasteurized versions of most cheeses are safe. When shopping, check the label: if it says “made with pasteurized milk,” you’re fine. The risk comes from artisanal or imported soft cheeses where pasteurization isn’t guaranteed, and from fresh-style Mexican cheeses that have been linked to repeated Listeria outbreaks regardless of the milk source.
Raw and Undercooked Meat
Undercooked meat is a primary route for Toxoplasma gondii, a parasite that can cross the placenta and cause miscarriage or severe developmental problems. A large study of infection sources found that lamb, mutton, and game meats like bear and feral swine pose the highest risk. Surprisingly, raw or undercooked beef and lamb showed a stronger link to infection than pork, despite pork’s traditional reputation as a Toxoplasma carrier.
The practical takeaway: cook all meat to its recommended safe internal temperature. Avoid tasting meat before it’s fully cooked, skip steak tartare and rare burgers, and be cautious with cured meats that haven’t been heated. Contact with raw meat on cutting boards and utensils matters too, so wash surfaces thoroughly.
Smoked and Raw Seafood
Refrigerated smoked seafood is a Listeria concern. Products labeled “nova-style,” “lox,” “kippered,” “smoked,” or “jerky” that sit in the refrigerated section can harbor the bacterium. The exception is smoked seafood used as an ingredient in a fully cooked dish, like a casserole, where the heat kills any bacteria. Shelf-stable (canned) smoked fish is also safe.
Raw fish in sushi and sashimi carries additional risks from parasites and other bacteria. If you’re craving sushi, cooked rolls or vegetable rolls are a safer option.
High-Mercury Fish
Mercury doesn’t directly cause miscarriage in the way an infection does, but high levels of methylmercury damage a developing baby’s nervous system. The FDA lists seven fish to avoid entirely during pregnancy: king mackerel, marlin, orange roughy, shark, swordfish, tilefish from the Gulf of Mexico, and bigeye tuna. These species accumulate the highest mercury concentrations because they’re large, long-lived predators.
Other fish are not only safe but recommended. Fish provide omega-3 fats, iron, iodine, and choline, all of which support fetal brain and spinal cord development. Lower-mercury options like salmon, sardines, tilapia, and shrimp are good choices, with two to three servings a week being a reasonable target.
Raw Sprouts
Alfalfa, clover, mung bean, and radish sprouts grow in warm, humid conditions that are ideal for Listeria, Salmonella, and E. coli. Unlike most produce, sprouts can harbor bacteria on the inside of the sprout itself, not just the surface. Washing does not remove all germs, and home-grown sprouts carry the same risk because they need the same growing conditions. The only way to make sprouts safe is to cook them thoroughly.
Unpasteurized Juice and Cider
Fresh-squeezed juice sold at farm stands, juice bars, or farmers’ markets is often unpasteurized. The same goes for fresh apple cider. These beverages have been linked to outbreaks of E. coli and other pathogens. During pregnancy, your immune system is naturally suppressed in ways that make foodborne illness more likely and more severe. Store-bought juice that’s been pasteurized (the label will say so) is safe.
Caffeine in Large Amounts
Caffeine doesn’t need to be eliminated, but quantity matters. The current recommended limit during pregnancy is 200 mg per day, roughly two standard cups of coffee. A meta-analysis found that for every additional 150 mg of caffeine per day above that threshold, the risk of pregnancy loss rose by 19%. A separate analysis found that even 100 mg per day was associated with a 14% increased risk in some study designs.
Keep in mind that caffeine shows up in more than just coffee. Tea, chocolate, energy drinks, and some sodas all contribute to your daily total. If you’re a heavy coffee drinker, cutting back to one or two cups a day brings you within the recommended range.
Alcohol
There is no known safe amount of alcohol during pregnancy, and no safe trimester in which to drink it. Alcohol use is associated with increased risk of miscarriage, preterm birth, and stillbirth. In the first trimester, it can cause abnormal facial development. Later in pregnancy, it can impair brain growth and lead to low birthweight and behavioral problems. The baby’s brain develops throughout all nine months and remains vulnerable to alcohol at every stage.
Liver and Vitamin A Overload
Organ meats, especially liver, contain extremely high concentrations of preformed vitamin A (retinol). While vitamin A is essential in normal amounts, doses above 10,000 IU per day from supplements or food have been linked to birth defects in at least one large study. A single serving of beef liver can contain well over 20,000 IU. The recommended daily amount for pregnant women is only about 2,670 IU.
This doesn’t mean you need to panic if you’ve eaten liver once. Occasional exposure is different from daily high intake. But making liver a regular part of your diet, or stacking a prenatal vitamin with an additional vitamin A supplement, can push you into risky territory. Check your prenatal vitamin label: if the vitamin A comes from beta-carotene (a plant-based form), your body converts only what it needs, and the risk of toxicity is much lower.
What Actually Matters Most
The foods on this list don’t guarantee a miscarriage. Many women unknowingly eat deli meat or have a cup of coffee over the daily limit and have perfectly healthy pregnancies. The risk from any single exposure is generally small. What these foods share is that they introduce an avoidable hazard, whether that’s a dangerous bacterium, a parasite, a heavy metal, or a toxic dose of a vitamin, during a period when both your immune system and your developing baby are unusually vulnerable.
The pattern across nearly every item on this list comes down to two things: cooking food thoroughly and choosing pasteurized products. Those two habits eliminate the vast majority of the bacterial and parasitic risks. For mercury, caffeine, and vitamin A, it’s a matter of knowing which specific items to limit or avoid rather than overhauling your entire diet.