Good nutrition could help students from low-income families perform better academically, according to a recent study.

Researchers at the University of Iowa found that students who attend schools that participate in the U.S. Department of Agriculture's School Breakfast Program (SBP) have higher achievement scores in math, science, and reading than students in schools that don't participate.

"These results suggest that the persistent exposure to the relatively more nutritious breakfast offered through the subsidized breakfast program throughout elementary school can yield important gains in achievement," David Frisvold, researcher and assistant professor of economics in the Tippie College of Business, said in a statement.

The federal government started the free school breakfast program or children from low-income families in 1966. The program is administered in coordination with state governments, many of which require local school districts to offer subsidized breakfasts if a certain percentage of their overall enrollment comes from families that meet income eligibility guidelines.

For the study, Frisvold examined academic performance from students in schools that are just below the threshold -- and thus not required to offer free breakfasts -- and those that are just over it -- and thus do offer them.

He found that schools that offered free breakfasts showed significantly better academic performance than schools that did not, and that the impact was cumulative so that the longer the school participated in the SBP, the higher their achievement. Math scores were about 25 percent higher at participating schools during a students' elementary school tenure than would be expected otherwise.

Reading and science scores showed similar gains.

The findings, which are detailed in the journal Public Economics, suggest that subsidized breakfast programs are an effective tool to help elementary school students from low income families achieve more in school and be better prepared for later life.