"The food industry, at the end of the day, is in the business to make money by selling food," said Dr. Stephen Cook of Golisano Children's Hospital at the University of Rochester Medical Center. "If a 'healthy' label on their product gets it to be sold more, then they will try that -- even if it is not true."
Nutrition experts also told ABC News that the FDA should move faster on its 2009 plan to develop a nutritional gold standard for products labeled healthy.
"The FDA is responsible for package labels, so it makes sense that they would establish parameters for what goes on the label," said Connie Diekman, director of University Nutrition at Washington University in St. Louis. "In addition, a consistent criteria for measuring 'healthy' would make shopping much easier for consumers."
In a written statement, Walmart said the labeling criteria "have undergone an extensive evaluation process using thousands of grocery items to help ensure that only nutritious items in each grocery category receive the 'Great for You' icon."
Walmart is not putting a restriction on the new labeling system and said other grocers are welcome to use the system.
For a complete list of the detailed system of what gets the label and what doesn't, click here.