Have you ever changed your mind about a restaurant order once you saw the calorie count? You’re not alone. New research shows that 1 in 6 people have second thoughts.

The Office of Science and Policy in New York City wanted to test the effectiveness of its new labeling law, which requires restaurant chains to post information on calories, fat, and salt. So they examined the spending habits of the lunchtime crowd at several fast-food chains and compared them with the cash register receipts from the year before the law took effect.

The result: Customers made definite changes in the foods they ordered at several restaurant chains. For instance, McDonald’s customers ordered 44 fewer calories, KFC customers ate 59 fewer calories, and Au Bon Pain customers cut their consumption by 80 calories. It may not seem like much, but if you ate a restaurant meal twice a day, that’s enough to lose one pound a month without changing anything else.