Some days going outside for shopping groceries is just not "on the menu".
But anyway, if you are eating alone there is generally a real imbalance between the time required for preparing a meal and cleaning up afterwards versus the time required for eating. On low energy days this can be already too much.
Ah, that's a bummer. I found it invaluable in conjunction ordering from a warehouse type store like Costco, followed by batch cooking and refrigerating or freezing things so I have low effort meals throughout the week.
Also, sheet pan meals are an incredibly low effort way to eat pretty healthy.