Acommon health myth is that people should drink at least eight glasses of water per day. while staying hydrated is important, why could this advice be inaccurate for different people?

This advice would be inaccurate given that different people require different amounts of water daily. This could depend on a person's body weight or some other health factors, but every person needs to drink as much water as they need. There shouldn't be a specific number of glasses that everyone should drink, because not all people are the same and have the same needs.