By Jamie Condliffe

For some, three double expressos is barely enough to get them out of bed; for others, the whiff of weak latte is enough to have them jittering. Now, it turns out that those differing reactions are genetic.

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Source:: http://feeds.gawker.com/~r/gizmodo/full/~3/bx2oEOLEgYE/our-differing-coffee-consumption-habits-are-genetic-1643255337