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 ...

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The Ninja Sip Perfect insulated cup is available in the 12oz and 16oz size at Amazon in an assortment of colorways. I have the 16oz version in white, but quite fancy the Rose Quartz colorway.

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).