The National School Lunch Act created the National School Lunch Program in 1946 to ensure that low-income children received a fully or partially subsidized meal in the middle of their school day. Revisions to the program were made under President Lyndon B. Johnson with the enactment of the Child Nutrition Act, which integrated the school lunch programming with the Special Milk Program and launched a new national School Breakfast Program. Numerous studies have confirmed a link between school performance and the school breakfast program. More recently, the Healthy, Hunger-Free Kids Act of 2010 was signed into law by President Barack Obama and serves to reauthorize expenditures on food programming for children. Nutrition standards for school breakfasts and lunches were revised for the first time in 15 years through the passage of the act to align them more closely with healthy foods recommended by the Dietary Guidelines for Americans. The federal government had faced increased pressure to improve the nutritional quality of meals served in public schools over the last several decades from a wide range of advocacy groups with a goal of aligning the foods served with the Dietary Guidelines for Americans which are based on scientific research showing the benefits of whole grains, fruits, and vegetables and reductions in added sugars, refined grains, and sodium. Some of the pressure stemmed from federal efforts in the 1980s to broaden the definition of qualifying food groups.