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It’s officially easier to find out how many calories are in that chicken sandwich or cheeseburger.

Starting Monday, calorie information must appear on menus at major restaurants and other places that sell restaurant-style foods such as supermarkets, convenience stores and movie theaters, according to a Food and Drug Administration policy.

The policy applies to companies with 20 locations or more. FDA officials say the measure is designed to inspire Americans to make informed, healthier choices while encouraging food producers to offer lower-calorie options.

“As someone who enjoys eating out with my family and picking up the occasional take-out meal, I – like many Americans – want to know what’s in the food I eat,” FDA Commissioner Scott Gottlieb said in a statement.

Eating out can mean more calories

Americans love to dine out – to the tune of about $3,000 a year per household. But the dollars have been far easier to calculate than the calories.

Unlike packaged food, which comes with a nutrition label, there’s been no transparency about the calories count in restaurant food, popcorn and even cocktails.

That information is important, health experts say, because there are typically just more calories outside the home. People typically eat 20 percent to 40 percent more calories than they would at home, experts say.

Those excess calories contribute to the high obesity rates in the U.S. despite research indicating many Americans want to eat healthier. A poll found 73 percent of Americans are fairly focused on healthy and nutritious eating, yet their diets are unchanged.

Menu labeling could help dispel some common misconceptions about calories.

Salad, for example, seems like it’s always the healthier option. However, a Wendy’s Spicy Chicken Salad has about 720 calories and almost a day’s worth of sodium. The Cheesecake Factory Grilled Chicken Tostada Salad has 1,600 calories.

Health experts point out that salads can be made healthier by putting the dressing on the side and using less of it.

A New York Times found that the typical Chipotle order contains about 1,070 calories – double the amount in a Big Mac.

How are restaurants adapting?

Many large restaurant chains support the policy and have already tweaked their menus.

Other restaurants have gone even further to deliver not just transparency through caloric awareness through menu-board labeling but have changed ingredients and menu options that deliver healthy meal options.

McDonald’s has made several significant changes, such as switching from margarine to real butter and removing artificial preservatives from Chicken McNuggets.

“McDonald’s USA has always believed in continuous improvement and we evolve our menu and the choices we offer based on input from our consumers to meet their changing needs,” said Cynthia Goody, McDonald’s Senior Director of Menu Innovation.

To prepare for the policy, large-scale food service and facilities providers have spent several years collaborating with dietitians, food producers and food service staff to deliver healthy meal innovations.

Dan Wainfan, Aramark’s associate vice president of health and wellness, said menu labeling is the last step in the process. The Aramark team also has redeveloped recipes and provided compliance training to staff.

Menu labeling is just one part of the larger effort to address the obesity issue, Wainfan said. It’s equally important – if not more important – to provide information and tools so people feel empowered to change behavior, he said.

The impact on consumers

Research suggests more information alone isn’t enough to improve eating habits.

A in Health Affairs found that calorie information on menus appears to increase awareness but doesn’t necessarily lead people to change their purchases.

Rogan Kersh, provost and professor of political science at Wake Forest University and one of the authors of the study, said menu labels help put dietary options in perspective.

“Calorie labels combined with a visible reminder that the FDA recommends 2,000 calories as daily consumption for a healthy adult -- that makes an appreciable difference,” he said. “Consumers aware of the context for their food choices are more likely to make balanced, relatively healthy decisions.”

Alice Lichtenstein, Gershoff Professor of Nutrition Science and Policy at Tufts University, agrees educational tools are important to change eating habits.

“With any kind of initiative like this it is important to adequately educate people about how to use it,” she said. “In addition, we should not discount the residual benefits of product reformulation that results in lower calorie content of individual items. That may ultimately be the most important effect of mandatory calorie labeling, the default option is the better choice.”