Does fasting for weight loss work?

I used to fast one day a week for religious reasons, so I know it’s something I can do with little effort.

I can’t exactly do the whole “diet” thing, because buying specific foods is beyond my budget. I have to buy what is least expensive, so the popular two-smoothies-and-a-meal thing isn’t happening (seriously, have you seen the prices of berries?)

Counting calories seems like more of a pain in the arse than anything else. For one, there’s math involved. For two, I literally lack the ability to form positive habits like writing shit down every day, or taking a daily multivitamin. I have to set an alarm timer to remind me to take prescription medication.

Anyway, as far as a simple way of cutting caloric intake, is there any downside to just skipping a day or two of eating per week?