Schools and Junk food (not banned)

Schools should sell junk food because some junk food companies like pizza hut motivate students to do their best so they can get rewarded with some of their junk food.  For junk food companies its better to advertise and sell their products at school because they give the school scholarships and educational programs.  If these companies were banned from the school from selling their junk food the schools would suffer a lot because these companies provide programs for many students and without these programs a lot of students can loose scholarships or educational programs that are neccesary for them.
Source: Corporate Sponsorships in Schools  ABC CLIO 

The junk food companies help schools get some cash that they probably would not be able to get without the help of these junk food companies.  Some schools need the extra cash for their programs and that is why they have to turn to selling vending machines full of junk food.  This help both the junk food company and the school with its programs its good for both sides.
Source:The Fast Food Trap SIRS

Some students do not like to be told what to eat even if the student is old enough to know what is good or bad for them.  According to the article "School Cafeterias to Try Psychology in Lunch Line" states that some students have abandoned school meal programs that tried to force healthy options.  This comes to show that junk food is neccesary for many reasons including the way students feel about them.  Truth is vending machines filled with junk food is important and neccesary for schools.
Source: School Cafeterias to Try Psychology in Lunch Line Proquest