This scale doesn't really work globally. There are many poor people in Singapore who eat out three times a day, because there are subsidized hawker meals that cost less than cooking by yourself. Also, "could" is fuzzy: I could eat "ALL" meals if I wanted to, but I don't particularly want to.
If you have less than 7 meal a week, you are poor.
If you have a meal a day and not 3 a day you are upper poor.
If you have 3 meals a day but have to eat at home you are lower middle class.
If you can go out to eat a few times a week you are middle class.
If you could go out to eat most meals you are upper middle class.
If you can go out for ALL meals you are lower upper class.
If you can have ALL your meals delivered you are upper class.
If you have a full time chef you are upper upper class.