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It's also worth noting that an 8-ounce cup may be considered the usual, but many coffee drinkers opt for 12 to 16 ounces depending on location and brand, which at many cafes can kick up caffeine ...

The study didn't just look at coffee drinkers, either. It actually looked at data from over 46,000 adults, with information dating back nearly 20 years (between 1999 and 2018).