Top 8 Vegetables Pregnant Women Should Limit to Reduce the Risk of Miscarriage and Preterm Birth

Purslane ranks fourth on the list and is known for its numerous health benefits, including being rich in vitamin A, vitamin C, folate, calcium, magnesium, and omega-3 fatty acids. While generally safe in moderation, there are concerns about consuming too much purslane during pregnancy. One reason for limiting its intake is its high oxalic acid content, which can interfere with calcium absorption, a vital mineral for fetal bone development. Excessive oxalic acid can also increase the risk of kidney stones. Additionally, purslane has been found to have uterine-stimulating properties, which can trigger contractions and potentially lead to miscarriage, preterm labor, or early delivery. Pregnant women should avoid excessive consumption and consult a doctor before incorporating it into their diet.

According to traditional medicine, Vietnamese balm has a spicy taste, warming properties, and a fragrant scent, and is considered non-toxic. It is typically paired with foods that have cooling properties, such as clams, snails, balut eggs, or chicken. Historically, it has been known for aiding digestion, warming the stomach, stimulating appetite, expelling cold, disinfecting, strengthening the bones, improving eyesight, and enhancing cognitive function. Despite these benefits, Vietnamese balm may not be suitable for pregnant women, as it can pose potential risks. Consuming it in the first two months of pregnancy can lead to miscarriage due to its uterine-stimulating properties that can induce contractions. After the third month, pregnant women can consume it in moderation without harm. If you wish to enjoy Vietnamese balm, it's safe to eat small quantities 1-2 times a week (about 5-7 leaves at a time) and in combination with other dishes. If you have a history of preterm birth or miscarriage, it's best to avoid it along with other foods that could stimulate uterine contractions.

Wormwood is rich in vitamins and minerals, especially folate, which plays a crucial role in brain and nerve development, preventing birth defects in the baby. However, the compound thujone found in wormwood can stimulate uterine contractions, leading to miscarriage or preterm birth. It may also contribute to kidney failure or worsen existing kidney conditions in pregnant women. During the first three months of pregnancy, it is advised to avoid wormwood as it may cause the uterus to contract, potentially leading to pregnancy loss. A study conducted in 2020 revealed that thujone could be toxic and disrupt neural signaling. To ensure a healthy pregnancy and prevent neurological complications, pregnant women should consume wormwood in moderation, if at all.

As you may know, pregnancy brings hormonal changes and an increase in metabolism, often causing a feeling of internal heat. To alleviate this, pregnant women are advised to include more green vegetables in their diet, including cooling and detoxifying herbs like gotu kola. However, the health site Herbal Safety has warned that excessive consumption of this herb can lead to bloating, discomfort, and in more severe cases, uterine contractions that increase the risk of miscarriage. Research indicates that long-term use of gotu kola can trigger spontaneous abortion in pregnant women. Additionally, consuming too much of this herb can raise blood sugar and lipid levels. For expectant mothers at risk of weight gain, obesity, or diabetes, it's best to limit foods containing gotu kola as a primary ingredient.

Ranked eighth on the list is Kale, also known as borecole. This leafy green vegetable has either green or purple leaves, with the center leaves not forming a head. It is closely related to cabbage, unlike many other vegetables. While kale is beneficial for women during their menstrual cycle, it is not recommended for pregnant women. Kale contains a high amount of vitamin C, even more than oranges. Excessive consumption of kale can lead to vitamin C overdose, which may cause birth defects in the baby. Therefore, pregnant women should consult with a doctor before incorporating kale into their diet to ensure the safety of both mother and baby.

Topping the list is Moringa, a highly nutritious plant that is generally great for health, but is categorized as one of the "vegetables pregnant women should avoid." Studies show that consuming moringa during pregnancy can increase the iron levels in the body, which helps prevent iron deficiency anemia. However, these benefits only come from the leaves. The roots, bark, or flowers of the moringa plant, on the other hand, contain chemicals that may induce uterine contractions, leading to a higher risk of placenta detachment, preterm birth, or miscarriage. Scientific reports reveal that the harmful compounds causing uterine contractions in moringa are alkaloids and plant toxins in the phytochemical group, including moringine, moringinine, estrogen, and pectinesterase. Even more dangerously, some researchers suspect that extracts from the roots of moringa could potentially paralyze or even cause death in pregnant women. Therefore, moringa is a vegetable that pregnant women should avoid for maximum safety for both mother and baby.

Vietnamese coriander has a mild, refreshing, and naturally sweet flavor. Eating this herb in moderation will not harm the baby, but excessive or frequent consumption should be avoided. This is because Vietnamese coriander contains a compound called papaverine, which acts as an antispasmodic often used to treat abdominal pain caused by various reasons. However, consuming too much papaverine can lead to low blood pressure in pregnant women. Studies show that prolonged exposure to papaverine during the first trimester of pregnancy can double the risk of preterm birth or low birth weight. Therefore, Vietnamese coriander is a vegetable that expectant mothers should not overconsume or eat continuously for extended periods.

Fresh bamboo shoots contain cyanide, which, when consumed, is converted into cyanide acid (HCN) in the digestive system by enzymes. This substance is highly toxic and can lead to poisoning. However, the cyanide content in bamboo shoots can be reduced by up to 97% through proper peeling, washing, fermenting, or cooking with heat. Pregnant women should never eat raw bamboo shoots. On the other hand, pickled bamboo, stir-fried bamboo, or canned bamboo, as long as they have been prepared properly, are safe to consume. One important note is to avoid bamboo shoots during the first trimester, as this is a sensitive period where excessive intake may cause bloating, indigestion, and the glucoside in bamboo can interfere with iron metabolism in the body.