> @hendler: "Grounds[sic] for more research for sure."

I fresh grind coffee beans for each cup, with a coffee maker that has a bean bin, so it's not convenient to swap types of beans.

To control caffeine intake while enjoying coffee, I use decaf beans, and take an aspirin+caffeine tablet with the first cup of decaf but not with subsequent cups.

This lets me regulate caffeine, gives me the RDA of aspirin, and lets me enjoy as many cups as suits a given morning without risk of jitters.

That said, I can certainly understand why the researchers would think to check caffeine alone vs decaf alone, while not checking caffeine + decaf. I suspect my use case is unusual.

I'm surprised the seriousface brigade on HN hasn't lynched you for saying that in a thread about coffee.