Here's an interesting article - I'm going to have to make sure my wife doesn't see this or I'll never hear the end of it 
Regular Caffeine Consumption Tied to Reduced Brain Volume (medscape.com)
Regular caffeine consumption is tied to reduced gray matter volume but not because of its potential negative impact on sleep, new research shows.
Investigators found the impact of caffeine on gray matter appears to be temporary, with a rebound after a period of caffeine abstinence.
It's not possible to say whether the effect of caffeine on brain structure is harmful, first author Yu-Shiuan Lin, PhD student, Centre for Chronobiology, University of Basel, Switzerland, told Medscape Medical News.
"So far we don't have clear evidence yet indicating any functional consequences of the reduced gray matter. We also don't know if such restorable plasticity per se entails gains or harms," she added.
Cheers

Regular Caffeine Consumption Tied to Reduced Brain Volume (medscape.com)
Regular caffeine consumption is tied to reduced gray matter volume but not because of its potential negative impact on sleep, new research shows.
Investigators found the impact of caffeine on gray matter appears to be temporary, with a rebound after a period of caffeine abstinence.
It's not possible to say whether the effect of caffeine on brain structure is harmful, first author Yu-Shiuan Lin, PhD student, Centre for Chronobiology, University of Basel, Switzerland, told Medscape Medical News.
"So far we don't have clear evidence yet indicating any functional consequences of the reduced gray matter. We also don't know if such restorable plasticity per se entails gains or harms," she added.
Cheers

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