To be fair, I'm also seeing people spend crazy % of their income on housing. The lack of a kitchen might have other causes!

Fast food is (sadly) not the type of meal that's expensive. I doubt the proper meals my mom cooked (meat+potatoes/pasta+vegetables) in a kitchen are significantly cheaper than sticking a 3.5€ frozen pizza in an oven, whereas space for a stove, countertop, cupboards and everything is at least like 3x2=6m², × ~12€/m²/month = almost a month's worth of frozen pizza's :P

Not that I've actually ever seen living space without kitchen, maybe that's not as much of thing in western Europe