I said almost anyone for a reason. Just because general advice doesn't apply to you specifically, doesn't mean it doesn't apply to the average person then either.
Average monthly cost of groceries in my country in 2020:
- Single person: 300€
- Single parent, one child: 350€
- Couple: 550€
- Single parent, two childs, 620€
- Couple, two childs: 760€