You can eat string beans in early pregnancy, but you should be careful to cook them thoroughly and thoroughly before eating them. Because they contain saponin, phytohemagglutinin and trypsin inhibitors, undercooked beans can easily cause side effects. The beans are nutritious and rich in fiber, iron, phosphorus, copper and other inorganic salts, as well as folic acid. During pregnancy, pregnant women are prone to constipation due to reduced exercise and the pressure of an enlarged uterus. The fiber in the beans can promote gastrointestinal motility and relieve constipation. It can also reduce the pregnancy reaction in the early stages of pregnancy and improve appetite. Iron and folic acid can prevent anemia, and folic acid can also promote the development of the fetal nervous system to prevent neural tube abnormalities.