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I feel that if I have unsweetened tea, it has a stronger hit. i.e. it is more stimulating than a similar cup of tea in which some sugar has been added. I can say the same about coffee.

Is it just me or is it something which is commonly perceived?

Is there a biochemical basis for this feeling or is it psychological due to the slight bitter taste?

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my money is on and entirely biochemical and physical, tastebud-reason. –  Random O'Reilly Dec 22 '13 at 0:40
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