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keylimedragon t1_j8jjw45 wrote

Reply to comment by halofreak7777 in High coffee consumption may triple kidney disease risk in some people by LordNPython

Edit: The report says they're treating a cup as 100mg of caffeine from Italian espresso.

It's hard to find an authoritative source, but from googling it seems like a "standard cup" is indeed 8oz of coffee and it contains about 95mg of caffeine.

The FDA also says 8oz but 80-100mg caffeine.

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Misabi t1_j8jwia7 wrote

>The report says they're treating a cup as 100mg of caffeine from Italian espresso.

Traditionally that would also be made with coffee containing more robusta beans in Italy, which has higher caffeine than the Arabica coffee generally used in the US. A double shot of espresso made from arabica in most coffee shops would likely contain 60mg to 80mg of caffeine.

"Espresso typically has 63 mg of caffeine in 1 ounce (the amount in one shot), according to Department of Agriculture nutrition data. Regular coffee, by contrast, has 12 to 16 mg of caffeine in every ounce, on average. That means that ounce for ounce, espresso has more caffeine.6/01/2023"

source

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keylimedragon t1_j8k2bfl wrote

The study doesn't say, but I'm wondering if since it's an observational study, they estimated total mg of caffeine per day and divided by 100 to get cups. But it's weird that they specify Italian espresso specifically and you're right that an espresso shot has about 60-65mg so it would be about 1.5 shots per cup.

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