It's because he cares for his child that he did that.

The father lives with his wife's daughter from a previous marriage. Even though she is not his biological child, he loves her as if she were his own. Although the girl has grown up, he still keeps track of her eating habits because he cares about her health, but she still refuses to listen. This is the punishment he has given to his daughter, and it is also out of love that he acts this way.