Lately, science has started to confirm what people around the world seem to have known for ages: Wine and well-being go together. Red wine appears especially promising as a defense against some of today's most serious diseases. But when it comes to identifying wine's exact benefits and how to best attain them, that's where -- to use a wine connoisseur's term -- the matter gets cloudy. When something you enjoy might also be good for you, it's tempting to blur the line between scientific evidence and wishful thinking -- especially when encouraged by attention-grabbing media reports and opportunistic marketers.
Here are five things we can say, with all reasonable certainty, about red wine's nutritional impact -- until research shows otherwise, that is.