WASHINGTON — Consumers hoping to consistently find out how many calories are in that burger and fries may have to wait – again.

New government rules to help people find out how many calories are in their restaurant meals are set to go into effect next week after years of delays. But they could be pushed back again if grocery stores, convenience stores and pizza delivery chains get their way.

Originally passed as part of the health care overhaul in 2010, the law requires restaurants and other establishments that sell prepared foods and have 20 or more locations to post the calorie content of food “clearly and conspicuously” on their menus, menu boards and displays. The delays have come as those businesses that never wanted to be part of the law say it is burdensome and fiercely lobby against it.

Facing a May 5 compliance deadline set by the Food and Drug Administration last year, those groups are eyeing a massive spending bill that Congress will have to pass in the next week to keep the government open. They’re hoping to either delay the menu labeling rules again or include legislation in the larger bill that would revise the law and make it easier for some businesses to comply.

At the same time, the FDA is signaling it may act on the issue even sooner. In a typical first step before a rule or decision is announced, the agency has sent language to the White House for review that would delay the compliance date.

A delay would be the latest of many. The FDA took more than four years to write the rules, and establishments originally had until the end of 2015 to comply. That was pushed to 2016 and then to May 2017.

The idea behind the menu labeling law is people may pass on that bacon double cheeseburger at a chain restaurant, hot dog at a gas station or large popcorn at the movie theater if they know that it has hundreds of calories. But grocery stores and convenience stores have said the rules would be more burdensome for them than they would be for restaurants, which typically have more limited offerings. The majority of prepared foods in grocery stores will have to be labeled – from the salad bar to the hot food bar to cookies.

The industry groups are backing legislation by Rep. Cathy McMorris Rodgers, R-Wash., that would narrow labeling requirements for supermarkets by allowing stores to use a menu or menu board in a prepared foods area instead of labels on items. It would also allow restaurants like pizza chains that receive most of their orders remotely to post calories online instead of at the retail location, as the rules now require.

McMorris Rodgers, a member of House leadership, has been pushing for her legislation to be included in the spending bill. But if it’s not included, a delay by the FDA could give Congress the needed time to pass it.

With the nutrition-minded Obama administration out and President Trump promising to repeal burdensome regulations, the groups think they finally have a chance to win concessions on the law.