Restaurant-goers won't be seeing calorie counts on menus anytime soon as the Food and Drug Administration works on a new menu labeling law.

Writing a new menu labeling law "has gotten extremely thorny" when it comes to figuring out who should actually be covered by law, FDA Commissioner Margaret Hamburg told the Associated Press.

The President's 2010 health care law tasked the FDA with requiring calorie counts from restaurants and vending machines.

"There are very, very strong opinions and powerful voices both on the consumer and public health side and on the industry side," Hamburg said.

"We have worked very hard to sort of figure out what really makes sense and also what is implementable," she said.

Some non-restaurant establishments are lobbying hard to be exempt. The FDA said the rules may come out this spring.