Why can't I drink caffeine before donating blood?

Why can't I drink caffeine before donating blood?

Caffeine is a diuretic and very rich in antioxidants. This means that all the extra water you are trying to use to stay hydrated can be removed from your system when you drink caffeine. Donating blood means losing even more fluids from the body. 

This can make you dehydrated which is why it is advised to avoid alcohol and caffeine for at least 24 hours prior to donating blood. 

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