Depends on the situation....
Regarding food:
For us mostly drinking water or tea, hardly any alcohol etc.
Rarely eating out, no time or desire.
Costs are low there too.
About 100€ per week plus daycare meals.
But that is not a conscious restriction, it has always been like this for us.
Income quite okay as a skilled worker and doctor.
At least so that my salary is left despite loan payments, but excluding special repayments.
As said, needs and reality.
House additional costs all in 300€ with electricity, sewage, property tax, phone, internet, [Gez] etc.
Only expensive are 2 cars in maintenance.