Olive oil is safe to consume during pregnancy and offers several meaningful benefits for both mother and baby. It’s a staple of the Mediterranean diet, which is one of the most studied dietary patterns in prenatal research, and no evidence suggests any risk from normal dietary amounts. In fact, consuming olive oil regularly during pregnancy is linked to healthier birth weights, better blood sugar regulation, and lower rates of certain pregnancy complications.
How Olive Oil Supports a Healthy Pregnancy
Olive oil is rich in monounsaturated fatty acids, particularly oleic acid, which plays a direct role in fetal development. In animal studies, oleic acid administered during pregnancy increased brain weight and the density of new brain cells in offspring, and those offspring later showed measurably better cognitive performance. While human studies are more limited, oleic acid is recognized as important for brain growth during fetal development, and olive oil is one of the best dietary sources.
Beyond healthy fats, olive oil contains vitamin E (which pregnant women need about 15 mg per day) and vitamin K, along with plant compounds called polyphenols. These polyphenols appear to be responsible for some of olive oil’s unique protective effects. One study found that consuming at least 5 grams of olive oil per day (roughly one teaspoon) was associated with a 47% lower risk of having a baby that was small for gestational age, compared to women who consumed less. Researchers noted that this benefit was linked to the oil itself, not just its fat content, suggesting those plant compounds matter.
Effects on Gestational Diabetes and Preeclampsia
A systematic review covering 14 studies found that higher olive oil consumption was associated with a lower prevalence of gestational diabetes, preeclampsia, and cardiovascular risk during pregnancy. These are among the most serious complications pregnant women face, and dietary patterns appear to play a real role in prevention.
Research on women already diagnosed with gestational diabetes found particularly striking results. Women with gestational diabetes who followed a diet enriched with extra virgin olive oil showed improved insulin resistance and healthier cholesterol ratios compared to women with gestational diabetes who did not. The olive oil group also had healthier placental tissue at delivery, with normalized glycogen storage and better markers of placental function. The researchers concluded that the enriched diet appeared to regulate both maternal metabolism and placental health in ways that could benefit fetal development.
How Much to Use
There is no official recommended dose of olive oil for pregnancy, but the research showing protective effects used relatively modest amounts. The study linking olive oil to healthier birth weights set the threshold at just 5 grams per day, which is barely more than a teaspoon. Most people who cook with olive oil or use it in salad dressings easily consume one to three tablespoons daily, which falls well within the range studied.
Because olive oil is calorie-dense (about 120 calories per tablespoon), it makes sense to use it as a replacement for other fats rather than adding it on top of your usual intake. Swap it in for butter when sautéing vegetables, drizzle it over salads, or use it in place of other cooking oils. This approach gives you the benefits without unnecessary extra calories during a time when weight management already requires attention.
One Caution: Heartburn
Pregnancy heartburn affects the majority of women, especially in later trimesters, and fatty foods of any kind can make it worse. While olive oil is a healthier fat than many alternatives, it’s still a fat. If you’re dealing with reflux, the Cleveland Clinic recommends avoiding large amounts of fatty foods and eating smaller, more frequent meals. Using olive oil in moderate amounts as part of a meal is unlikely to cause problems, but drinking it straight or using it heavily in cooking may trigger symptoms. Eating slowly, staying upright for at least two hours after meals, and not eating within three hours of bedtime can also help.
Choosing the Right Olive Oil
Extra virgin olive oil is the least processed form and retains the highest levels of polyphenols, which appear to drive many of the pregnancy-related benefits. In the birth weight study, nearly 80% of the olive oil participants consumed was extra virgin grade. Lower grades (labeled simply “olive oil” or “light olive oil”) have been refined and contain fewer of these protective compounds.
Adulteration is a real issue in the olive oil market, with some products diluted with cheaper seed oils. To reduce your risk of buying a substandard product, look for bottles with a harvest date (not just an expiration date), choose oils with a protected designation of origin (PDO) or protected geographical indication (PGI) label when available, and buy from reputable brands. Dark glass bottles help protect the oil from light degradation. Once opened, store it in a cool, dark place and use it within a few months.
Does It Prevent Stretch Marks?
Many pregnant women apply olive oil topically hoping to prevent stretch marks, but the evidence is disappointing. A randomized controlled trial of 100 first-time mothers found that applying olive oil twice daily to the abdomen throughout pregnancy did not significantly reduce the overall incidence or severity of stretch marks compared to using nothing at all. The olive oil group had slightly fewer severe stretch marks, but the difference was not statistically significant. Based on this evidence, olive oil is not an effective stretch mark prevention strategy, though it’s harmless to use if you find it soothing for dry skin.