It is better to drink a moderate amount of light salt water before donating blood.
Drinking a small amount of light salt water before donating blood can increase the blood volume of the donor for a short period of time, avoiding symptoms such as panic, dizziness, nausea and vomiting.
Be careful not to donate blood on an empty stomach to avoid symptoms such as panic, dizziness and nausea caused when donating too much blood. Keep your energy intake sufficient before donating blood, you can eat some food such as cookies and bread before donating blood. After donating blood, you should take more rest to avoid over-exertion, which may cause physical injury.
Before donating blood, you should pay attention to keep your mind calm, don’t stay up late the night before, eat a light diet, don’t drink alcohol or take medication, and donate blood in a healthy state, and women should pay attention to avoid the physiological period.