Walmart, by doing what it does best, has lowered the cost of fruits, vegetables, and whole grain products.

FORBES: The Food Police Lay The Groundwork For A 2013 Food Fight

The rules require that, over the next two school years, whole-grain products must account for half of the grain products served in school lunches.

WSJ: School Lunches to Become Healthier

By the 2014-15 school year, all grain products must be whole-grain, the agency said.

WSJ: School Lunches to Become Healthier

The Whole Grains Council developed a black and yellow stamp that food manufacturers can use to tout products that contain at least half a serving or more of whole grain.

CNN: Don't be afraid of the dark -- whole grains explained

"There are a lot of products out there that use tricky wording so you believe it's whole grain when it's not, " says Cynthia Harriman, director of food and nutrition strategies at the Whole Grains Council, a subsidiary of the nonprofit food advocacy group Oldways Preservation Trust.

CNN: Don't be afraid of the dark -- whole grains explained