News for hackers. Stuff that matters.

A comment on Coffee doesn't just wake you up–a biological pathway illuminates health effects. Parent comment

Re:Coffee doesn't just wake you up–a biological pathway illu... by vikingerik on Sunday May 03, 2026 @02:08PM (#47999677)
FYI since many people don't know: Decaf isn't zero, it can still be several percentage points. In the US decaf is supposed to be under 3% of regular coffee but it's not commonly tested or enforced, so many types of decaf can be quite a bit higher. Several big cups of decaf can approach the caffeine content of one regular cup.
[ Parent | on HN ]
Re:Coffee doesn't just wake you up–a biological pathway illu... by esperent on Sunday May 03, 2026 @02:16PM (#47999768)
> Several big cups of decaf can approach the caffeine content of one regular cup

Do you have a source for this? Because it doesn't sound right to me. And also, I live in a coffee producing company, work adjacent to the coffee industry, and had a long conversation with someone planning to set up a business exporting green beans to the US, and their beans were getting tested to an extreme degree and being rejected for a few ppm over on certain things.

I have heard the 3% rule but fyi it's 1% in the EU and since there's actually not that many large scale decaffeination factories in the world, as far as I know they all target the EU level.

If you buy small batch, large batch, or somewhere in between it's probably been processed in one of these few large factories.

[ Parent | on HN ]
Re:Coffee doesn't just wake you up–a biological pathway illu... by vikingerik on Sunday May 03, 2026 @07:31PM (#48002743)
Just Wikipedia. It cites two studies that found values of 8-13 mg and 3-32 mg per decaf cup, compared to regular which is 95-200. https://en.wikipedia.org/wiki/Decaffeination
[ Parent | on HN ]
Re:Coffee doesn't just wake you up–a biological pathway illu... by esperent on Monday May 04, 2026 @02:37AM (#48005375)
The linked Wikipedia "study" is this science daily article:

https://www.sciencedaily.com/releases/2006/10/061012185602.h...

And that article links back to this UFL press release. I've clicked every link I can find and there's not an actual, published study to be found anywhere:

https://archive.news.ufl.edu/articles/2006/10/uf-experts-dec...

But even if there was, is a study from 20 years ago still relevant?

[ Parent | on HN ]