Wal-Mart (NYSE: WMT) has introduced a program to promote healthy, affordable foods, in a measure backed by First Lady Michelle Obama’s efforts to reduce childhood obesity.

Specifically, Wal-Mart plans to lower prices of fruits and vegetables while cutting back on sodium and sugar content in other products. The retailer also seeks to construct stores in under-served poor regions of the country.

The retailer said it plans to having reduced sodium content by 25 percent and sugar by 10 percent in its processed goods, and to phase out any remaining trans-fats.

Mrs. Obama said she is “thrilled” by Wal-Mart’s measures.

I believe this charter is a huge victory for folks all across this country, she said in Washington, alongside Wal-Mart executives. “[This] has the potential to transform the marketplace and help Americans put healthier foods on their tables every single day. We are really gaining some momentum on this issue, we're beginning to see things move.”

Bill Simon, president and chief executive of Wal-Mart, said “no family should have to choose between food that is healthier for them and food they can afford.”

However, Michelle Obama’s relationship with the company. Prior to Barack Obama’s election as president, she resigned from the board of a Wal-Mart supplier after her husband criticized its anti-union policies.