Wine Color & Glass Are Factors
Just as the size and the color of the plate effect how much food we eat, so does the shape of the glass and the color of the vintage influence how much wine we drink. Iowa State University researchers found in a study of wine drinking that because people tend to measure liquid vertically and not horizontally, we pour twelve percent more wine into a wide-mouth wineglass than we do into a standard-sized one. For reasons unknown, we also pour nine percent more wine when the vintage is white than when it's red, given a clear glass, and we pour nine to twelve percent more when the glass is in our hand than when it’s on a table. The three factors together can result in the equivalent of an entire extra serving of wine consumed for every two poured, according to the researchers.