Is the buzz gone from your morning coffee?

Do you wait to speak, get dressed, or do any work until you feel the sweet relief of your first cup of coffee kick in? If so, that buzz you can't wait to feel might not be coming from caffeine after all.

A British study shows that people who ingest medium to high levels of caffeine may actually build a tolerance to caffeine so that drinking coffee or tea in the morning only brings them back to "baseline levels of alertness" and nothing more.

That first cup, according to researchers at Bristol University, is really only getting people who drink a lot of caffeinated beverages back to normal.

"Although frequent consumers feel alerted by caffeine, especially by their morning tea, coffee, or other caffeine-containing drink, evidence suggests that this is actually merely the reversal of the fatiguing effects of acute caffeine withdrawal," researchers assessed.

Have you built up this kind of tolerance to caffeine? How many cups of coffee or tea (or cans of Red Bull or Diet Coke) does it take for you to really feel the buzz?

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