Earlier quoted context omitted.
I don't think you're using units that could allow anyone to detect whether it's caffeine quantity or bioavailability that's at play. It depends on how you dose your espresso and drip coffee. I don't drink espresso but I think people are dosing something like 20 grams per shot, whereas for pourover they're dosing 18 grams of water per gram of coffee. For a standard "coffee cup" (which is 5 ounces of water that results…
> "cup" is a terrible terrible unit that needs to die Yes. Or more to the point, all of them are; not least because of the existence of all the others. I know it's rarely going to actually matter that much even when I try to follow a recipe (which to the letter and quantity at least, I generally don't) whether '1 cup' is US legal, Imperial (UK but not common), metric, Canadian, US customary, or any of the other count…
For some recipes those kind of measures are helpful though, so I wouldn't get rid of them. I'll always have a cup handy (a British cup is, handily, the same amount most people would make for a nice cup of tea:) but I won't always have scales.