The 1,40 burgers are barely enough to satiate a child, even with fries.

A menu that can fill an adult, that's 13-14€ easily. And that's still just one meal.

The quality 3 meals a day I consume and make at home average 5€ per portion. resulting in 450€ food budget per person per month, I generally go for white label products if the quality is good enough.

That's 900€ a month for 2 people for food alone (this was 300ish before COVID).
850-1000€ for entry level 1 bedroom rent here, brings us to 1750-1900€ a month for a roof and food, another 75-100 for electricity (and then you have to be very usage conscious) brings us to 1825-2000€ a month, add required insurance (fire/health/accidents) for another 50-100€ brings us to 1875-2100€ a month.

Now, a phone and internet sub are pretty much a requirement these days, so say the cost of a cheap phone, internet and gsm abbo combine to be another 50€ a month per person.

So we're at 1975-2200€ a month to cover the very basic living expenses for a 2 person household.

You'd need to have one person with a decent wage or two people working minimum wage to barely get by.

Any surprise or extra cost and you're in the red.

Eating McDonnalds to cover breakfast, lunch and dinner every day, you'd need over 2000€ for food alone.