While I'm always happy to hear good news about coffee (although as an espresso aficionado, I'd be hard pressed to consume half a litre a day), given the obvious

While I'm always happy to hear good news about coffee (although as an espresso aficionado, I'd be hard pressed to consume half a litre a day), given the obvious difference between coffee and water, I don't see how this can be a 'single-blind' study.