Several chains have vowed to cut back on sodium.
"We review our menu and nutrition criteria on an ongoing basis to ensure it is consistent with established scientific and government standards," wrote Burger King spokeswoman Alix Salyers in an email.
"As part of its commitment, BKC has successfully reduced the sodium content in many of its products around the world," she added.
Darden Restaurants has committed to reduce calories and sodium across its brands' menus by 10 percent by next year and by 20 percent by 2021.
"While I can't provide any figures, I can tell you we're making excellent strides toward our goal of reducing calories and sodium by 10 percent," said Darden Director of Communications Rich Jeffers.
Since 2008, Taco Bell has cut sodium by an average of 15 percent across its menu.
"Sodium reduction is an ongoing journey for us, and we'll continue to work with our suppliers and other industry experts who have already started their own sodium reduction overhaul processes and achieved success," wrote Missy Nelson, menu developer and registered dietitian at Taco Bell, in an email.
Meanwhile, Dunkin' Donuts has pledged to reduce its U.S. menu's sodium content by 10 percent by year end, a goal it first set in 2012. Sandwich chain Potbelly CEO and President Aylwin B. Lewis also reiterated its vow to tackle sodium reduction "over the next few years" during a May call with investors.
Boston Market also made a splash in 2012 when it got rid of tabletop salt shakes and vowed to slash sodium across its menu.