What are the most common dietary complaints during pregnancy?

During early pregnancy, most women experience an increased appetite, with extra caloric needs of approximately 200 kcal/d. Stomach motility does decrease, probably due to reduced production of motilin. Reduced peptic ulcer disease is due to reduced gastric acid secretion. Prolonged transit times through the colon are also reported, with transit from the stomach to the cecum occurring in about 58 hours instead of 52.

The common myths surrounding food desires are individually and culturally determined. Among rural Southern American women, the most common food cravings include clay, laundry starch, or pica, while British women commonly crave coal. Women experiencing nausea or hyperemesis may develop ptyalism (spitting). Reported fluid losses of 1-2 L/d can occur in these women.

Source: http://emedicine.medscape.com/