There are apparently many factors that affect how much wine a person pours, including the size of the glass and the color of the liquid, a new study has found.
Researchers at Iowa State and Cornell universities found that certain factors can cause people to pour themselves more than one serving size when drinking wine, especially in a social setting.
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The study, published earlier this month in the journal Substance Use and Misuse, found that when given a wide glass, participants poured themselves 12 percent more wine than when given a standard size glass.
"That's why people tend to drink less when they drink from a narrow glass," researcher Laura Smarandescu, an assistant professor of marketing at Iowa State University, said in a statement.
When using a clear glass, study participants poured themselves 9 percent more white wine than red wine. Researchers theorized that the contrast of red wine against the glass was a more visual serving size marker, according to Today.com.
People also tend to pour more wine when they're holding a glass as opposed to resting it on a table or flat surface, Smarandescu said.
These inconsistencies mean that people are often consuming two or three servings of wine when they think they've only had one.
"If you want to pour and drink less wine, stick to the narrow wineglasses and only pour if your glass is on the table or counter and not in your hand — in either case you’ll pour about 9-12 percent less," study researcher Brian Wansink, director of the Food and Brand Lab at Cornell University, said in a statement.
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