Going several days straight to fast food places will surely decrease your overall mood, and since they don’t have enough nutrition you will start to feel kind of week.
If you really want to be in your best productive mood I will limit fast food to like 1 or 2 times per week.
Btw, fast food will hardly help keeping a fit body, so that’s another reason to avoid them.
Maybe if you could find a way to share food with friends. I mean, everyday is someone’s turns and that person must cook a healthy meal for 7 people. And you rotate so 1 day is your turn and the next day is another’s person turn and there you go... you would have a week full of healthy meals while only cooking one day 🤟