You've just pointed out how important teachers and the school system are for children's health. You mentioned two problematic conditions that occur frequently, but there are many others. Teachers are under a lot of pressure at the moment. They need to be capable of dealing with behavioural and social-emotional disorders, not to mention the usual teaching problems, and now, they're supposed to be able to learn how to deal with celiac disease and diabetes.
One of the secrets of success is the partnership between the health and educational systems, not only for behavioural and learning disorders, but also health. There are several pilot projects underway in Quebec on this. There are often nurses in the schools, but fewer and fewer of late because they too are in short supply.
Having medical staff and health professionals support the school systems is the key to success for these children. The families need to be equipped, but so do the schools.