> Scientists think that up to 400 milligrams of caffeine–the equivalent of roughly four cups of coffee–is probably safe for most healthy adults.

Am I the only one who thinks this is a lot? I don't want to argue against this. When I was doing my bachelor's I pulled all nighters with one or two 500ml Monster energy drinks which is ~320mg max. Of course all nighters are not healthy but I was mostly worried about the caffeine intake.