The test is mainly to detect the concentration of HCG in blood or urine, which will not be affected by eating, and normal diet will not affect the change of HCG concentration. It is only if the HCG test is done through urine, the dilution of the urine caused by drinking a lot of water, if the HCG concentration is not particularly high, there may be false negatives, but the blood test will not be affected by drinking water. HCG is called human chorionic gonadotropin, a protein hormone secreted by the trophoblast of the placental syncytium. The placenta does not begin to secrete HCG until the seventh day after the formation of the fertilized egg, so to test for pregnancy, HCG can only be drawn from the mother’s blood on the eighth day after the formation of the fertilized egg, at the latest, to confirm pregnancy. It is recommended that the most accurate way to test for pregnancy is to have a blood test for HCG about 10 days after intercourse. In short, eating will not affect the results of the HCG blood test.