- So much coffee per day is healthy Nau.ch
- Research into cardiovascular diseases: How many cups of coffee per day are healthy? MIRROR ONLINE
- Research: of this amount, coffee becomes a health hazard Heilpraxisnet.de
- Researchers determine the maximum number of cups: those who drink more coffee every day, live dangerously CHIP Online Germany
- Coffee: How many cups per day should the upper limit be kurier.at?
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