Right, that's why fast food is thriving despite everyone knowing what shit it is - it fills a hole fast and cheap enough, and you're not using any of your own energy - physically from the utility, but also physically, and mentally, from yourself to prepare it (and before that you have to refrigerate ingredients or keep them frozen so you have to own and pay to run a fridge/freezer as well as an oven or toaster or hob, and before that you have to shop for ingredients, it all takes money, time, and energy of every kind).

The problem isn't how people go about trying to survive (like eating cereal for dinner), it's the people making billions off of the industries and institutions that require workers be in such a desperate state in the first place.

Beans from a can, champignons from a glass, bit of corn from a can. Put it on a tortilla with a bit of salsa for flavor. I add some flax seeds cause they are supposed to be good for your intestinal health. Obviously this tastes better when you take some time to prepare it in a pan, but it's cheap, very filling and takes a few minutes to prepare at most. I like to eat it cold on hot summer days.