The Atlantic tries to figure out how much caffeine is unhealthy to put in you body. Yes, it’s about coffee. The number 400 mg is thrown around as a limit:

Four hundred milligrams amounts to around four cups of coffee in the old-style sense of the phrase, an eight-ounce mug in a diner. It’s more like one Starbucks venti.

If this was the case, almost everyone in Sweden is overdosing caffeine on a daily basis. Granted, the piece also states that more research is needed and that it’s most likely individual.

Personally I feel I’ve had enough coffee when I’m starting to feel sick.