It's cheap, people like it, and it counter acts what the body may interpret as a sudden drop in blood glucose level which can sometimes cause a person to be dizzy and similar symptoms. Some places use a cookie or similar for the same reason, it causes a small rapid rise in blood glucose.
I think it might have to do with potassium? How much potassium is lost during a normal blood donation?
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Quoted message said:
It's cheap, people like it, and it counter acts what the body may interpret as a sudden drop in blood glucose level which can sometimes cause a person to be dizzy and similar symptoms. Some places use a cookie or similar for the same reason, it causes a small rapid rise in blood glucose.