A new study has found that children will still buy meals from the school cafeteria when the food is healthier, and that providing healthy lunches isn’t necessarily much costlier than unhealthy lunches. Researchers at the University of Minnesota examined five years of data from Minnesota public schools and found that healthier foods, like fruits and veggies, often cost less than processed foods, and school lunch sales didn’t decline when the meals were healthier.

However, the researchers determined that many school districts would have to pay to upgrade kitchens and train cafeteria staff to prepare the healthier foods.