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Its a common misconception that you have to be wealthy to afford good, healthy food. My Mum had very little money when I and my brothers were kids in the 60's, but could do wonders with a pound of mince and some potatoes. Likewise with fruit, to make apple pies for afters. I am no slim Jim these days, but we were certainly not obese when we were kids.
Another aspect of this is table manners. My sister-in-law is a dinner lady at her local primary school, and says that its obvious which children come to school that haven't sat up a table properly to eat meals, as they seems to want to wander around the dining room at school.
I am constantly amazed at so many people not having proper table and chairs in ther houses these days.