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When you roll in at 4:00 a.m. but you have a presentation at 9:00 (sh.itjust.works)

submitted 1 year ago by rastro@sh.itjust.works to c/funny@sh.itjust.works

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[–] dannoffs@lemmy.sdf.org 13 points 1 year ago (1 children)

This isn't true. Unless you're roasting until it literally takes like only charcoal, like noticably darker than a 2nd wave French roast, caffeine doesn't really roast out. Caffeine also seems to be pretty significantly more soluble in darker roasts so between two cups brewed normally with the same mass of coffee, there will be more caffeine in the darker cup. They will have almost the same amount of caffeine if you do a cold brew process.

[–] agent_flounder@lemmy.one 24 points 1 year ago

I kind of love being wrong and updating what I know. I had to find some sources.

https://www.kickinghorsecoffee.com/which-roast-has-more-caffeine

https://www.healthline.com/nutrition/light-vs-dark-roast-coffee

dark roasts tend to be slightly lower in caffeine after the roasting process.

That said, recent and older studies alike suggest that the difference is negligible.

This one references actual scientific studies.

https://pubmed.ncbi.nlm.nih.gov/25212328/

https://pubmed.ncbi.nlm.nih.gov/22032554/

https://pubmed.ncbi.nlm.nih.gov/34071879/

https://pubmed.ncbi.nlm.nih.gov/34200293/