Policy Intervention With Potential: Forbid Unhealthy Snacks And Sell Fruit

So what? No potential shown here.

"The most interesting policy impact was found in schools that had fruit tuck shops along with policies that forbade students to bring food or only allowed fruit to be brought to school. Compared to children in schools that did not have a fruit tuck shop, children in tuck-shop schools in which only fruit was allowed to be brought consumed 0.37 more portions of fruit per day. Children in schools that forbade any type of food to be brought consumed 0.14 more fruit portions each day. At schools that did not have restrictions on what type of food could be brought, children consumed less fruit than in other schools - whether or not the school had a fruit tuck shop."

Meaningless.