Regulating School Snacks

We have a proposal in my state legislature to ban all "unhealthy" snacks and drinks (junk foods and soft drinks) from school vending machines. This is not an innovative idea, as many states already ban snack machines from their campuses, or regulate the kinds of things that can be sold from them.
It's all allegedly an attempt to emphasize to kids the importance of healthy foods and to cut back on the obesity problem, we have here. The schools in my state allow vending machines, and regulate use to before and after school, and during lunch. Since the time frame for snacking from the machines is small, little is consumed from the machines.
But opposition to taking the machines away or putting "healthy" snacks (fruit juices, unflavored a water, milk and non sugary or fatty snacks) and drinks in them is high. School officials (who use the machine revenue to finance school projects), soft drink companies (who make a profit, but more importantly advertise and addict the kids to their soft drinks, and vending machine companies (who say they will lose too much money if healthy foods replace the more popular junk foods) oppose the change, pointing to the fact that the calorie laden , huge lunches kids eat in the cafeteria are far more fattening an unhealthy than vending machine snacks.
So the dilemma is whether the machines are bad or at least bad examples to kids of what kinds of food to eat, or whether the idea to ban the machines or put other foods in them is political grandstanding. Regardless, those machines have become gold to many schools.
One of the school principals testifying before the state legislature said his school receives $100,000 under a ten year contract with coca cola that might be endangered by the proposal, and that his school budget and other schools like his are also somewhat dependent on those kinds of deals.
It seems silly to me to do this. It's not a school candy bar or soft drink that makes kids fat. it's over consumption (including in the school cafeteria) that does it. Too, the reality is that student consumption from school vending machines is very low. But the the politicians are consuming this issue for as much as they can, getting fat on be sanctimonious about "saving the kids".