INS and diabetes mellitus: LF polysaccharides can reduce fasting blood glucose (FBG), insulin (INS), the insulin resistance index (IRI), serum total triglyceride (TG), total cholesterol (TC), interleukin‐18 (IL‐18), IL‐6, malonic dialdehyde (MDA), endometrial ACSL4, and PTGS2 protein expression levels; increase serum superoxide dismutase (SOD); and play a protective role in gestational DM rats.