First of all, some people are diabetics and if they eat they could get seriously ill and even die. If however, they refuse to eat, they can lapse into unconsciousness and eventually experience a seizure, which if left unchecked can also cause death. Since you provided nothing that they can eat, they might not be able to eat at all, which leaves them feeling unwanted, ignored, or neglected. But more serious yet, they could die if they eat and they could die if they don't eat. Next there are hypoglycemics, children with A.D.D. and other behavioral and learning problems which may be highly exacerbated by sugar.
Most children become hyperactive when they overdose on sugar.
They might run wild. Finally, everyone will go home full but malnourished. They ate, but they weren't satisfied. They feel fed, but have a nagging suspicion that they really weren't truly fed. Now let's apply this spiritually, because the ill effects of the spiritually imbalanced diet are even more potentially serious than the ill effects of the naturally imbalanced meal.