Generate text that refutes this claim: Better nutrition leads to better students.  There is a growing body of evidence linking a healthy lifestyle, comprising of both adequate nutrition and physical exercise, with improved memory, concentration and general academic performance. [1] A study has shown that when primary school students consume three or more junk food meals a week literacy and numeracy scores dropped by up to 16% compared to the average. [2]  This is a clear incentive for governments to push forward for healthier meals in schools for two reasons. The first obvious benefit is to the student, whose better grades award her improved upward mobility – especially important for ethnic groups stuck worst by the obesity epidemic and a lower average socioeconomic status.  The second benefit is to the schools, who benefit on standardized testing scores and reduced absenteeism, as well as reduced staff time and attention devoted to students with low academic performance or behavior problems and other hidden costs of low concentration and performance of students. [3]  [1] CDC, 'Student Health and Academic Achievement', 19 October 2010,  , accessed 9/11/2011  [2] Paton, Graeme, ‘Too much fast food ‘harms children’s test scores’’, The Telegraph, 22 May 2009,  accessed 20 September 2011  [3] Society for the Advancement of Education, 'Overweight students cost schools plenty', December 2004,  , 9/11/2011
health general weight house would ban junk food schools
Again, if this is in fact true, then the incentives are already in place for better choices both on the side of students as well as schools.  What the government should do is through subsidizing healthier meals and educational campaigns help both of them make those choices on their own, and not force an unnecessary ban on them.