Banning sodas from schools in New York has made a positive difference in student health from 2008-2010. Since some schools banned soda, most students' performance after lunch has decreased as they lack the sugar. Younger students especially struggle staying alert in afternoon classes without sugar. People are trying to ban sodas from all schools to curb child obesity and believe consistent changes to cafeteria options can shift kids' habits over time. About a quarter of US schools have already banned sodas with efforts ongoing to expand the bans.