(IAAC) IMO says don't drink Hot Drink while Observing in the Cold

The International Meteor Org states on their website 
"do not have hot drinks -- they dilute the blood vessels and make you feel 
This is really true? Everyone that I've ever observed with has always 
advacated "Drink some hot chocolate, or do you want something hot to drink?"
Is this indeed true?
I just can't see drinking a glass of cold chocolate milk in -30 degree 
windchills...... I'd much rather have some hot cocoa...
Let's have some discussion on whats better to drink when observing and if 
this is true or its just an old myth..
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