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posted by [identity profile] palfrey.livejournal.com at 12:08am on 27/11/2005
Not news to me actually. One of it's effects is the widening of blood vessels in the brain. However, apparently after you've been drinking enough of it for long enough, the blood vessels actually shrink back to a width smaller than before you were drinking the coffee. Net result is that you get a "withdrawal headache" of sorts, and that drinking more coffee (hence widening the blood vessels) only brings you back to a pseudo-normal state rather than actually giving you any benefit.

Plus there's psychological vs. physiological addiction. You can get psychologically addicted to damn near *anything*, and the compulsion can be practically as strong as physiological effects.
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