CINCINNATI - A group of 300 former military generals and admirals claim junk food sold in schools is becoming an issue affecting national security.

A report released Tuesday from the non-profit group  Mission: Readiness is detailing the problem of junk food sold in schools across America. The report it released said it's joining parents and nutritionists in supporting the limit of junk food sales in schools.

About one in four American adults are now too overweight to join the military, according to the report. Being overweight is the now the No. 1 medical reason why young adults cannot enlist, the report cited.

Students in the United States are eating almost 400 billion calories from junk food sold in schools each year, which is equivalent to nearly two billion candy bars, according to the report.

The rate of obesity is still climbing among boys age 12 to 19 years, researchers said.

With the amount of overweight individuals, the military could have a problem finding a "sufficient number of well-educated recruits without serious criminal backgrounds" or "excess body fat," the report said.