As good as apples are for your physical health, they can also affect you psychologically in a way you probably never thought of.

Cornell researchers found that just by having an apple or some other healthy snack before grocery shopping, can lead to healthier food choices.

Researchers had 120 people either eat an apple sample, cookie sample or nothing and then sent them off to shop.

When they were finished, the shoppers who snacked on the apple bought 28 percent more produce than the cookie eaters and 25 percent more fruits and vegetables than the consumers who shopped on an empty stomach.

The theory is that it's the perceived healthfulness of a snack that compels people to make better food choices than the actual health benefits of fruits and veggies.