There are many main reasons for loss of appetite during pregnancy, mainly due to the following: first, hormonal reasons, especially in early pregnancy, due to the rapid increase of chorionic gonadotropin, resulting in slowing down of gastrointestinal peristalsis and reduced secretion of digestive juices, resulting in indigestion, abdominal distension, loss of appetite, and even vomiting, which can generally be relieved after 3 months; second, mental factors, especially in first pregnancy. As the first pregnancy leads to its performance of excessive mental tension, anxiety, depression, etc., in these cases will lead to the inhibition of the sympathetic nerves of the gastrointestinal tract, slowing down the intestinal peristalsis, and thus the loss of appetite. In addition, excessive tension will lead to anorexia nervosa, appetite will also be significantly reduced; third, physiological factors, mainly in late pregnancy, with the growth of the fetus, the uterus will also increase in size, when the uterus pressure on the stomach will lead to smaller stomach cavity, intestinal narrowing, will also appear loss of appetite phenomenon.