RBP4 and cerebrovascular disorder: The statuses of the protein, Vitamin A, and iron, as well as cardiovascular, cerebrovascular disease and carcinoma, are five main fields of nutrition and health in China [3], which mainly involve nine protein markers, including pre-albumin (PA), retinol-binding protein 4 (RBP4), serum ferritin (SF), soluble transferrin receptor (sTfR), C-reactive protein (CRP), apolipoprotein B (Apo B), D-Dimer (D-D), alpha-fetoprotein (AFP) and carcinoma embryonic antigen (CEA).