Very little. It takes a bit longer than donating whole blood, you usually have to make an appointment rather than walking in off the street, and you need to go to a special clinic.
It has some advantages, in that you don't lose your red cells, so if you are prone to low iron levels, giving plasma means less recovery time.
I worked out that a pint of blood takes 700 calories to replace. I suspect plasma is less.
You can give plasma more often than whole blood so if you are working towards prizes, you'll get there quickly. I'm up to 116 units of blood, and a fair few of those are plasma.
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