Is it permissible to obey one's parents in a matter that is known to be harmful to their health?

Obedience to parents is obligatory in permissible matters that benefit them and do not harm the child. No scholar is known to have prohibited the consumption of manufactured medicines because they contain chemical substances, as long as the benefit outweighs any harm. If your parents instruct you to bring medicine prescribed by their doctor or food containing sugar, hasten to obey their command, for they are ordering you to do something permissible, and they will be harmed by your disobedience.