The report finds that the School Lunch Initiative was effective in increasing student nutrition knowledge as well as preference for and consumption of healthy food, especially among elementary school students. Students’ attitudes about the taste and health value of school lunch improved as changes were put in place. It also found that continued School Lunch Initiative exposure into middle school may play an important role in mitigating the negative changes in eating behaviors that typically occur during adolescence.

http://www.schoollunchinitiative.org/downloads/sli_eval_exec_summary_2010.pdf