What is the most effective food for pregnant women with constipation? Pregnant women are prone to constipation. This is because hormonal changes during pregnancy and the enlargement of the uterus compress the rectum, which slows down intestinal peristalsis and makes constipation prone. At the same time, pregnant women also need to pay special attention to their diet. A reasonable combination of foods can help relieve constipation. The following are some of the most effective foods for pregnant women with constipation for your reference. 1. Eat more fiber-rich foods, including fiber-rich fruits, vegetables, whole grains, etc.