Q: Which has more caffeine: Light- or dark-roast coffee?

— Rebecca Click, Warren, Ohio

A: All of my research indicates that the caffeine content in the two is virtually the same.

Light-roast fans tend to think that their preferred coffee has more caffeine because it is roasted a shorter length of time, so its caffeine is not dissipated in the roasting process.

Fans of dark-roast tend to assume that because their coffee tastes stronger, it packs more caffeine.

The truth is that very little caffeine is lost in roasting, so the beans and the coffee they are brewed into have essentially the same amount of caffeine.

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