![]() ![]() High-income countries must shift their dietary patterns to address the increasing environmental burdens of food systems 1, 2, 3. To reduce the environmental impacts of the National School Lunch Program, our results support increasing whole grain requirements and providing serving size or frequency limits for beef. Lunches in the top quintile of impacts contributed an outsized proportion to total impacts (~40%) suggesting that policy changes related to these lunches should be prioritized. Meat products contributed the most (28–67%) to total impacts for all impact categories. The mean ± SE impact per lunch was 1.5 ± 0.03 kg CO 2 eq. during the 2014–2015 school year to inform school meal policy. Here, we collate life cycle inventories relevant to the National School Lunch Program and assess the environmental impacts of a representative sample of lunches served in the U.S. National School Lunch Program shapes the consumption of America’s children and adolescents, providing a meaningful opportunity to reduce dietary environmental impacts. Altering dietary patterns is essential to ameliorating the environmental impacts of the world food system.
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