The posting of calorie information isn't a magic bullet in fighting obesity but could have a big effect over time, says Margo Wootan, director of nutrition at the Center for Science in the Public Interest, which advocates on nutrition and food safety issues.
"Obesity isn't the kind of thing where one day you wake up and you're fat. We gradually and slowly gain weight over time," she said.
So even if only some people are swayed to make slightly better choices, Wootan thinks there's a big benefit to providing calorie information.
Another upside is that companies tend to work harder to provide healthier options when they're forced to display calorie information.
"It can be embarrassing, or shocking, so they end up changing the way the product is made," Wootan said.
"All the calories were up there, and I thought, well, I'm not going to order that," said Finn, 51, who's trying to watch what he eats. He ended up picking the most basic burger, without cheese. Back at home, he tries to stick to options where he knows the calorie information, such as Subway sandwiches.