Gestational diabetics are prone to constipation and cannot exercise vigorously, so lactulose is often prescribed to laxative, and gestational diabetics can take lactulose appropriately. First, because lactulose is a disaccharide, not the so-called glucose or fructose, sucrose, etc., it is mainly a functional oligosaccharide that can improve the flora of the sugar tract, and is a synthetic disaccharide. Because the stomach and small intestine lack the enzyme of lactose decomposition, it is not absorbed by the small intestine and can directly reach the colon intact. After reaching the colon, it is further decomposed into lactic acid acetic acid by bacteria such as Lactobacillus and Enterococcus faecalis to lower the pH value of the intestine, increase intestinal peristalsis and thus maintain the flow of substances in the intestine, and finally achieve the effect of laxative. Secondly, this disaccharide itself will not be absorbed and broken down into monosaccharides, so it does not have much effect on blood sugar. In addition, lactulose contains a small portion of lactose in a very small dose of about 6-10%. This lactose is a disaccharide that can be broken down into glucose at a relatively low level. But if you want to use a higher dose of lactulose, this condition is not suitable for gestational diabetes.