Watch out for: Soft cheese
Why: Cheeses like feta, goat cheese, Brie, Camembert, blue cheese, and Mexican queso fresco or queso blanco are more apt to be made with unpasteurized milk than harder cheeses like cheddar or Swiss. "There's a chance these soft cheeses could contain listeria, a bacteria that would otherwise get killed during pasteurization. This infection can lead to miscarriage or preterm delivery. Small-batch artisan cheeses (even harmless-sounding ones, like cheddar) are also often unpasteurized.
Watch out for: Cold cuts and deli meat
Why: As with soft cheeses, there's a small risk that harmful listeria bacteria may lurk in fresh-from-the-deli-counter meats like turkey and ham. Dr. Morse also advises steering clear of whole, cooked rotisserie chickens and turkey breasts if they're being stored in a refrigerated case. Listeria can survive cold temps, which means there's still an off-chance they could make you sick; however, chicken that has been recently cooked and is still under the warmer is fine.
Watch out for: High-mercury fish
Why: Certain fish mostly big, top-of-the-food chain types contain high levels of mercury, which isn't good for anyone's health (pregnant or not), but they can be particularly harmful to a developing baby's nervous system, lungs, kidneys, vision, and hearing.
On the Do-Not-Eat list: shark, swordfish, tilefish, king mackerel, orange roughy, grouper, tuna steaks, saltwater bass, and canned solid white albacore tuna (which is bigger, and has therefore more mercury than the smaller tunas used in the kind labeled "chunk light").
Bottom line: Steer clear of high-mercury fish, but don't give up seafood entirely. Many varieties, like salmon, herring, and sardines, contain heart-healthy omega-3 fatty acids including DHA, which research shows may boost fetal brain development. In fact, one recent study found that nearly 75 percent of pregnant women may not be eating enough low-mercury fish during pregnancy.
You should aim for up to 12 ounces a week (or about two generous servings) of these "safe fish" including salmon, shrimp, haddock, cod, catfish, flounder, sole, tilapia, and scallops. If you love tuna fish sandwiches, you can still eat the canned light kind once a week (about three to six ounces). Oh, and needless to say, we're talking about cooked fish here (more on sushi next).
Watch out for: Sushi and sashimi
Why: There's a slight chance that raw fish may contain bacteria or microbes that could cause food poisoning. "But the main concern with sushi is that in the unlikely event that you get a parasite, it's not only exceedingly unpleasant, it's harder to treat in pregnancy. The parasite can also take vital nutrients away from your growing baby," says Dr. Morse. Plus, some of the most popular sushi rolls (like spicy tuna) may contain too-high mercury levels.
Bottom line: Skip raw-fish sushi, but rolls made with fully-cooked fish are A-OK. Sushi made with eel, crab, or anything done tempura-style (which means it's been battered and fried) is perfectly safe to eat. California rolls also make the go-for-it list, as do veggie rolls, like avocado or cucumber.
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Watch out for: Raw or runny eggs
Why: There's a slight risk of salmonella and other food-borne illnesses from eggs cooked sunny side up, and from sources of uncooked eggs such as Caesar salad dressing or raw cookie dough. "Your immune system is weaker when you're pregnant, which means that a bug that wouldn't have caused food poisoning before may affect you more now," says Redfern. Also, vomiting or diarrhea that would have just been uncomfortable and annoying before you were pregnant can more easily trigger dehydration now, which has the potential to affect fetal growth and in rare cases can lead to preterm labor.
Bottom line: As long as you make sure your eggs are cooked through, it's safe to eat them and you should! Eggs are a great source of protein and choline, a nutrient that research shows may boost fetal brain development and prevent certain birth defects.
FYI: Most Caesar dressing from the supermarket is not made with raw eggs; it's the kind freshly prepared at restaurants that you should avoid.
Watch out for: High amounts of coffee, soda, or any caffeinated beverage
Why: Some research shows that lots of caffeine (considered to be more than two to three cups of coffee a day) can raise your risk of miscarriage. It has also been linked to preterm delivery and low birth weight. A Kaiser Permanente study, for example, found that pregnant women who consumed more than 200 milligrams of caffeine a day had double the miscarriage risk of those who had none.
Bottom line: Limit your caffeine intake, but you don't have to cut it out entirely. Most experts agree that a small cup of coffee or soda or two a day is probably fine. (Talk to your doctor if you're concerned or you have a history of miscarriage or preterm labor.) The tricky thing is that coffee's potency can vary greatly depending on the beans and how it's brewed. The cup you get at Starbucks, for example, is likely to be way stronger than the one you'd make at home. As a general rule, an 8-ounce home-brewed cup of java packs about 100 milligrams. Regular tea and caffeinated sodas contain about one-third of this amount per serving. Stay under 10 ounces of regular coffee and 20 ounces of regular tea; anything more should be decaf.
Watch out for: Saccharine
Why: Experts advise avoiding saccharine, the stuff in Sweet N' Low, during pregnancy. "Unlike other artificial sweeteners, like Equal or NutraSweet, saccharine can cross the placenta," Redfern says. "Even though it's been shown to be harmless in people, we recommend skipping it just to be extra cautious."
Bottom line: Skip Sweet'N Low, but you can use other artificial sweeteners in moderation. Those made with aspartame and sucralose, like Equal, NutraSweet, NutraTaste, and Splenda, are safe, according to the Food and Drug Administration (FDA). However, while a diet Coke or the packet of Equal you sprinkle into your cereal is probably fine, you don't want to eat and drink the stuff all day long, says Redfern. "It's not so much that they're unsafe, they're just not a healthy choice," says Redfern. "Especially when it comes to things like diet soda -- you're sipping fake everything instead of something actually nutritious, like 100 percent fruit juice or skim milk." For a natural low-calorie drink, she suggests adding two ounces of juice to 14 ounces of water with ice.
Watch out for: Herbal teas
Why: Some herbs can have medicinal effects just like actual drugs, which is why the FDA and many doctors advise steering clear of certain varieties. Even though the amount of herbs used in commercial teas isn't believed to be strong enough to cause problems, because the FDA doesn't regulate them, there's no way of knowing exactly how potent they are. "I generally recommend patients avoid teas containing chamomile and hibiscus because some evidence suggests that in high amounts they may cause problems like preterm labor," says Dr. Morse. "But the main reason we're so cautious is that we just don't have a lot of data here." Comfrey and sassafras are other herbs that experts recommend pregnant women avoid.
Bottom line: Check your herbal tea ingredient label and ask your doctor if there's anything in it you should avoid. Not all herbs are unsafe during pregnancy -- a cup or two of mild mint or fruit-flavored tea is fine, says Dr. Morse. So are green and black teas (just read labels and watch your caffeine intake). And stick to known brands to be on the safe side.
Watch out for: Spicy foods
Why: Piling on those jalapenos can give pregnant women major heartburn, something you're already prone to these days. While this won't harm your baby, it can feel lousy for you. And women with GERD (gastroesophageal reflux disease, a more severe, chronic form of heartburn) should take extra care to avoid spicy dishes.
Bottom line: If you get heartburn, skip anything spicy; if you don't, indulge away. (Just have Tums at the ready when you chow down.) If you've heard rumors that things like hot peppers, curries, Tabasco, fiery sauces and the like are thought to bring on labor, ignore them. There's no evidence that they do.
Watch out for: Alcohol
Why: It's a well-established fact that drinking alcohol frequently during pregnancy can seriously harm an unborn baby, causing a number of physical and mental birth defects. But we don't yet know exactly how much is harmful. There's no research, for instance, on the effects of having just a couple of drinks during pregnancy, so experts can't say what -- if anything -- is considered a safe amount. They do know that alcohol crosses the placenta right away, so your baby drinks whatever you do. "Since we don't know how much alcohol it actually takes to harm a fetus, it's best to just have none," says Dr. Morse.
Bottom line: It's safest to stick to virgin versions of your favorite drinks until baby arrives. But it's up to you and your healthcare provider to decide what you're comfortable with. Some doctors may be okay with a small glass of bubbly on New Year's Eve or an occasional drink toward the end of pregnancy.