A new study from Iowa State and Cornell Universities found glass size and shape impacts how much wine you pour. Overall researchers said people have trouble with volume, and most participants overshot the 5-ounce serving by about 12 percent. And people poured less wine in narrower glasses, since researchers say we focus more on the vertical measure than horizontal. They also found people poured more white wine than red wine as it’s harder to see, and they poured more wine while holding the glass than if they set it on the counter. So if you want to drink less wine, stick to narrower glasses and always place your glass on a table or counter before pouring.