We live in an area where 32% of kids are overweight by year 6.
I made lots of friends when my three were babies and I could have guessed which kids would be fat by the age of 1.
The largest kids (now all teens) parents are not poor (teachers, nurses, social workers in the main).
As babies and toddlers when went out for picnics etc already the food was different. I was very conscious of food as have a multitude of health problems and wanted to give the kids as good as start as possible.
The kids who are now fat were given pre made Ellas Kitchen tubes for the babies( basically sugar).
The older kids had white bread sandwiches with ham or cheese followed by bananas, crisps, sausage rolls, and biscuits
The kids that are fat were brought chopped veg, salads, berries, oatcakes, wholemeal bread, hummus, flapjacks.
Pack lunches, parties and meals out are the same. We have been on lots of day trips, camping, holidays together and things like we let our kids have one fizzy drink a day and one ice cream theirs have lots.
Screen times similar thing, the ones that restrict it have have more active kids, the ones that said "oh they self regulate" many now unfit kids who are addicted to their phones/xboxes. They hardly move from their rooms. Some of them are driven everywhere, don't walk to school and never have. Family outings are rarely about physical activities like swimming, hiking or playing tennis or football but are sitting down: the cinema or theatre followed by meals out.
Even trying to avoid it was hard . Every week it would be some kids birthday and my kids would come out with a little bag of sweets and then they would go to the party (class parties where the thing st primary- 32 a year, plus we would often get invited to older or year kids parties as mine would be friends if the siblings, they would then eat a ton if sweets and shite at the party and be sent home with party bags full of sweets. I used to take the party bags and chuck out half the sweets when. They weren't looking.
Packed lunches where another one. DS1 bf had lunchables, crisps and chocolate bar every day.
Lots of them have a Friday night takeaway and/or Maccy Ds classically after swimming. We couldn't afford this as skinter than most of our friends
Now these people are my friends. I love them and never say anything but now the kids are uni age the difference is stark. Some of the children/near adults are in size 20 plus clothes. Lots are size 14. The boys are in XL clothes. A couple of them can't walk more than 5k and definitely not up hill. These are loved, cared for kids who are great people, their parents adore them and worry about them, are spending weekends driving them to open days, have saved up for uni for them etc
Something has gone very very wrong.