It's not the amount of wine in your glass that makes you drink more, it's the size of the glassware you put your wine in.

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Researchers have found in a new study that bar wine sales increased when the establishment started using larger wine glasses. Researchers tracked the purchases made over a course of 16 weeks, during that period different sizes of glasses were used. Each serving was about 5.9 ounces of wine with the glasses being three different sizes: Small 8.4 oz, standard 10.1 oz, and large 12.5 oz.

The authors of the study could not explain exactly why the glass size would cause people to drink more. "One reason may be that larger glasses change our perceptions of the amount of wine, leading us to drink faster and order more," said Rachel Pechey, a public health research associate at the University of Cambridge.

Read more at Live Science.