You can eat by checking your blood type. Because blood type check is to check the special antigenic markers contained on the red blood cell membrane, there are two main blood group systems on the human red blood cell membrane: one is the ABO blood group system; the other is the Rh blood group system. Eating has no effect on the antigenicity of the human blood group system, so you can eat before checking the blood group without affecting the test result. In clinical practice, the commonly used blood systems are ABO blood group system and Rh blood group system. ABO blood group system is defined according to the antigens contained on the red blood cell membrane, those containing A antigen are A blood type, those containing B antigen are B blood type, those containing both A and B antigens are AB blood type, those without both antigens are O blood type. Rh blood group is defined according to the presence or absence of D antigen on the red blood cell membrane. The Rh blood group is defined by the presence or absence of D antigen on the red blood cell membrane, and is Rh positive if it contains D antigen, and Rh negative if it does not. All these test results are not related to eating, so you can eat if you check your blood type.