A new University of Cambridge study has revealed a fascinating method to control how much alcohol you drink—and it’s much simpler than abstaining. .

Research shows that drinking wine—particularly red wine—is healthy in moderation. It is linked to lower risk of heart disease, stroke, diabetes, and dementia.

“Moderation” is usually defined as one 5-ounce glass of wine a day for women and two for men. However it can be very  simple to go from a healthy amount to over drinking.

British researchers may have found a solution. They provided bar customers with three different size wine glasses: 8.4 ounces, standard 10.1-ounce glasses, and larger 12.5-ounce stemware.

All three glasses were filled with the same amount of wine, 5.9 ounces.

Scientists discovered that people using the larger wine glasses requested more refills and ended up drinking more.

The lead author of the study was Rachel Pechey. She’s a public health research associate at the University of Cambridge. It is believed that perception is responsible. In a larger glass, portions look smaller “leading us to drink faster and order more,” Pechey said.

The Bigger the Glass, the More You Drink

This may seem too simple, however, to drink less, simply use a smaller glass.

A 9.4% increase may not seem like much. But the health effects add up over time.

For example, a man who has two glasses of wine a night out of a smaller glass would end up with 9,717 fewer calories a year. Over five years, this would make him about 15 pounds lighter.

Many people enjoy a glass or two of red wine each night because of its anti-aging and heart benefits. It contains an antioxidant compound called resveratrol that has been shown to increase lifespan in mice. A University of London study found that procyanidins in red wine keep blood vessels healthy.

So drink up! (From a small glass.)