More restaurants list calories on their menus—what about salt?

May 5, 2017 by Alyssa Moran, The Conversation
Do you know how much salt is in your food? Credit: Jorge Royan, CC BY-SA

Which do you think has more salt: a Panera Bread wild blueberry scone or a large order of Burger King french fries?

Starting May 5, restaurants and stores across the U.S. were going to be required to include calorie counts on their menus. The Trump administration has delayed calorie labeling until next year, and is considering relaxing the requirements for certain food service establishments, a push that's been led by the supermarket and pizza lobbies.

In the meantime, some businesses will likely start implementing the labels anyway. The push toward transparency in nutrition is popular – more than 60 percent of Americans across political parties are in favor of the policy. Even the National Restaurant Association, the country's largest food service trade organization, supports it.

But calories don't capture everything about your food – like the fact that the Panera scone has twice as much salt as the large fries.

This led us to wonder whether consumers accurately estimate the salt in their restaurant meals. We analyzed the meals of more than 1,000 diners and discovered big misperceptions. This suggests consumers need more information about what's in their restaurant meals. Adding information about the of menu items could help.

Calorie labeling

Over the last decade, it has become increasingly common for restaurants to post calories on menus. New York City started the trend in 2008 by making this a requirement for chain restaurants, and several cities and states soon followed.

Some restaurant chains even started posting this information voluntarily nationwide. For example, Starbucks and McDonald's label all of the food on their menus (revealing that, surprisingly, a Starbucks Venti Frappuccino has more calories than a McDonald's Cheeseburger!).

As part of the Affordable Care Act (ACA), chain restaurants, supermarkets, movie theaters and similar food retailers with 20 or more locations will be required to include calories on menus. Places like Chipotle, AMC Theaters and even Whole Foods will need to post calories on nearly all foods that don't have a nutrition facts label. Menus will also note that most Americans need to consume about 2,000 calories per day, so consumers have a point of reference. (So far, these rules are not affected by the push to reform the ACA.)

It's not yet clear whether the initiative will push consumers to change their purchases. But there is some evidence that it may motivate restaurants to cut the calories in popular menu items. In recent years, restaurants have introduced new lower-calorie options, possibly in preparation for the labeling law.

Calorie labeling may seem like a win-win, supported by consumers and restaurants alike, but it has a downside. Because there's now a federal rule about nutrition disclosures on restaurant menus, state and local governments can't create a rule with different requirements. This means that cities can't require chain restaurants to post other nutrients – like sodium – on their menus.

Sodium on the menu

Prior to the federal law, state and local governments had considered adding sodium to menu boards. They hoped consumers would use this information to choose lower sodium items and that restaurants would reformulate menu items to be lower in salt.

High increases blood pressure, a major risk factor for heart disease and stroke. Though scientists disagree about optimal levels of sodium intake, there is widespread agreement that current levels of consumption among Americans are too high. In the U.S., the average adult consumes about 3,400 milligrams of sodium each day. That's nearly 50 percent higher than the current recommended upper limit of 2,300 mg per day. Researchers estimate that a 40 percent reduction in sodium over 10 years could avert up to half a million deaths.

Very little of the sodium in your diet comes from the salt shakers on your kitchen table. More than 70 percent is from packaged and restaurant foods. Salt may be used to make foods more palatable or as a preservative to extend shelf life.

As a result, high-sodium foods often don't even taste salty. For example, Panera's blueberry scone contains 900 mg of sodium – nearly 40 percent of the daily upper limit. Other items can vary widely in sodium content. A tuna sandwich at Au Bon Pain has 560 mg of sodium, while Cosi's has 1,099 mg.

In a 2015 survey across 26 states, most Americans reported taking action to reduce sodium in their diets. But if high-sodium foods don't always taste salty, and similar items can have drastically different amounts of sodium, do consumers really have the information they need to make low-sodium choices?

Massively underestimating sodium

We sought to answer this question by surveying adult and adolescent diners at six fast food restaurants in four New England cities.

We set up shop in restaurant parking lots and asked customers to estimate the recommended daily sodium intake, as well as to identify the amount of sodium in their meal purchase. We then calculated the actual sodium content of their meals by collecting each diner's receipt and matching purchases to sodium information from restaurant websites.

In our study, the sodium content of fast food meals was very high. On average, adult and adolescent meals contained about half of the recommended daily sodium intake. More than 10 percent of meals contained more than an entire day's worth of sodium.

Yet, awareness of sodium in meals was low. One-quarter of consumers could not provide an estimate. If they did, it was way off the mark. Eighty-eight percent of adolescents and 90 percent of adults underestimated sodium in their meals. On average, adults underestimated sodium by 1,013 mg and adolescents by 876 mg.

Underestimation worsened as sodium content of the meal increased, meaning consumers who purchased the highest-sodium meals had the hardest time with estimates. Most diners also underestimated their daily sodium recommendation, indicating a general lack of awareness both about how much sodium to consume in a day and how much foods contribute.

The case for sodium labels

People likely underestimate the sodium in their meals because there is no visible, prominent information at point of purchase. All of the restaurants in our study provided sodium information in some way – on websites, napkins, cups or posters. This doesn't appear to be an efficient means of communicating. Prior research has shown that fewer than 1 percent of consumers read nutrition information when provided in locations other than menus or menu boards.

Although federal laws prohibit cities and states from requiring sodium information on menu boards, there are policy options for addressing the underestimation problem. For example, New York City recently required chain restaurants to post sodium warning labels on boards next to items with more than 2,300 mg of sodium. The labels are considered food safety warnings, as compared to nutrition disclosures, which means they are not preempted by the federal law and are within the city's authority to regulate. This policy provides information about sodium at point of purchase and encourages restaurants to reformulate their highest sodium items. Other cities and states could enact similar policies.

Alternatively, restaurants could choose to voluntarily add sodium to their , making healthy choices easier for the 53 percent of Americans actively trying to reduce intake.

Explore further: Appeals court upholds restaurant salt warning

Related Stories

Appeals court upholds restaurant salt warning

March 17, 2017
(HealthDay)—An Empire State appeals court has upheld the New York City health department rule that requires restaurants to warn customers about menu items that exceed the 2,300 mg daily recommended sodium limit, according ...

Twenty-five food categories explain 70 percent of salt intake

April 3, 2017
(HealthDay)—For U.S. persons, 70 percent of dietary sodium comes from 25 food categories, with bread the top contributor, according to research published in the March 31 issue of the U.S. Centers for Disease Control and ...

Nutrition guidelines needed for full-service restaurant chains

January 8, 2014
Food prepared away from home is typically higher in calories and lower in nutrition than food prepared at home, but it now makes up more than one-third of all calories purchased in the United States. Consumers tend to view ...

Restaurant kids' meals make nutrition strides, but leave room for improvement

April 6, 2016
Eating meals from restaurants has become routine for many American children, often contributing excess calories, solid fats, sodium, and added sugar to diets already lacking in fruit, vegetables, and low-fat dairy. Many restaurants ...

Restaurants get temporary reprieve in New York salt war

March 1, 2016
A New York court on Monday temporarily stopped the city from issuing fines to chain restaurants that don't specifically label very salty items on their menus.

Despite menu changes, calorie and sodium levels in chain restaurant entrees remain the same overall

October 1, 2013
Although a number of chain restaurants have announced healthy menu changes over the years, the overall calorie and sodium levels in main entrees offered by top U.S. chain restaurants assessed from 2010 to 2011 have remained ...

Recommended for you

Three million Americans carry loaded handguns daily, study finds

October 19, 2017
An estimated 3 million adult American handgun owners carry a firearm loaded and on their person on a daily basis, and 9 million do so on a monthly basis, new research indicates. The vast majority cited protection as their ...

More teens than ever aren't getting enough sleep

October 19, 2017
If you're a young person who can't seem to get enough sleep, you're not alone: A new study led by San Diego State University Professor of Psychology Jean Twenge finds that adolescents today are sleeping fewer hours per night ...

Across Asia, liver cancer is linked to herbal remedies: study

October 18, 2017
Researchers have uncovered widespread evidence of a link between traditional Chinese herbal remedies and liver cancer across Asia, a study said Wednesday.

Eating better throughout adult years improves physical fitness in old age, suggests study

October 18, 2017
People who have a healthier diet throughout their adult lives are more likely to be stronger and fitter in older age than those who don't, according to a new study led by the University of Southampton.

Global calcium consumption appears low, especially in Asia

October 18, 2017
Daily calcium intake among adults appears to vary quite widely around the world in distinct regional patterns, according to a new systematic review of research data ahead of World Osteoporosis Day on Friday, Oct. 20.

New study: Nearly half of US medical care comes from emergency rooms

October 17, 2017
Nearly half of all US medical care is delivered by emergency departments, according to a new study by researchers at the University of Maryland School of Medicine (UMSOM). And in recent years, the percentage of care delivered ...

1 comment

Adjust slider to filter visible comments by rank

Display comments: newest first

NIPSZX
not rated yet May 08, 2017
Great insight! The consumer definitely needs the sodium content revealed A.S.A.P.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.