as a reaction against～：～の反動で

I rarely give snacks to my son because I believe that they deteriorate his teeth.
Furthermore, if it becomes habitual with him,
it will be difficult to break the habit.

However, I know there is a possibility that he may show strong interest in snacks or sweets
as a reaction against the restriction.

So, I make it a rule that he can eat them only when he gets up early from nap to
prevent him from losing his appetite for dinner.

Today he will fail to eat it because he is still sleeping... poor boy...