Excuse after excuse after excuse on this thread.
Supermarket too far.
Skint.
Poor mental health.
Special needs or learning difficulties
Chaotic house.
Awkward child wont eat anything else.
IMO none of those are good enough reasons to send a cold fast food takeaway meal for a child's lunch. A child needs a balanced meal to function properly and learn at school. Who knows the how's and whys this happened, buts lot of the excuses being thrown around as possible reasons are a crock of shit.
Supermarket too far
Order a big food shop to your door once a week or month. Get a bus or tram, or taxi if possible. Buy a pull along shopping buggy. Plan ahead and get food in for the week, fortnight or month.*
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Skint Buying shit and expensive takeaway food won't help that.
Nothing wrong with an occasional McDonald's, my kids are partial to a happy meal. But not a cold leftover one the next day. Just wrong. Budget. Buy supermarket value products. Bread, yoghurt, cheese, sandwich spreads and paste, apples, bananas, value yoghurt, all available cheaply if you make the effort to go to the supermarket and plan lunch meals.
Poor mental health I do have sympathy, but you still have children relying on you, it can't become normal to send that kind of meal to school. The child will suffer greatly eating that crap regularly. If the school picks up on something not being right it should be reported. The parent and children should get support. Get help for yourself if you recognise that you are struggling.
Special needs/learning difficulties You are still the adult who needs to make decisions about what is right for the child. You can't send a happy meal to school and say oh well s/he didn't want to eat anything else. You are the adult.
Chaotic house get your shit together and recognise you are the adult and you need to feed your children appropriately. Meal plan. Lunch box plan. Order school meals if putting appropriate food in a box is too much effort.
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Awkward child* you are still the adult who needs to make appropriate choices on behalf of your child.
Some people are just lazy and feckless and can't be bothered to do right by their kids. That is also a possibility here.