A member asked:

Could a high tolerance to caffeine affect your concentration?

A doctor has provided 1 answer
Dr. John Chiu answered

Probable: Nearly anything taken in excess is not good for our health. However i believe you are asking whether a heavy coffee-drinker may have problem with concentration. I don't believe this has been studied yet but if you are getting too much stimulants, it is not far-fetched to expect some adverse effects on your concentration.

Answered 9/5/2013

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