Leeks are a common vegetable that is rich in many nutrients, but it is not a suitable food option for pregnant women. This article will explain why pregnant women cannot eat leeks from both the nutritional content and health factors. First of all, leeks are rich in vitamin K. Vitamin K is a substance that promotes blood coagulation and is necessary for normal people. However, for pregnant women, too much vitamin K may cause the risk of blood clots, which is detrimental to the health of both the mother and the fetus. Therefore, pregnant women should limit their intake of leeks to avoid excess vitamin K. Secondly, leeks contain volatile sulfur compounds. These compounds give leeks their unique flavor, but they also pose some health concerns. Volatile sulfur compounds may irritate the gastrointestinal tract, causing stomach upset and indigestion. For pregnant women, the digestive system is already relatively sensitive, so eating leeks may aggravate these symptoms. In addition, leeks also contain some organic acids, such as oxalic acid and oxalate. These organic acids can interfere with the body\’s absorption of calcium to a certain extent. Calcium is an essential nutrient for bone development in pregnant women and fetuses, so pregnant women need to ensure adequate calcium intake. Eating leeks may reduce the absorption efficiency of calcium, thereby affecting the skeletal development of the fetus. In addition, leeks are also irritating and can easily cause flatulence and diarrhea. Pregnant women are prone to gastrointestinal problems during pregnancy, so eating leeks may worsen these symptoms. To sum up, although leeks are rich in various nutrients, they are not a suitable food choice for pregnant women. Vitamin K, volatile sulfur compounds, organic acids and irritating ingredients in leeks may have adverse effects on the health of pregnant women and fetuses. Therefore, pregnant women should avoid or limit the intake of leeks in their diet to ensure the health of themselves and their fetus. During pregnancy, pregnant women should choose other suitable vegetables to ensure the intake of various necessary nutrients.