``the underlying biochemistry of the "average adult" has changed as the result of food and activities during childhood''
Our food changed sometime in the '70s or '80s. When I was a kid, overweight people were rather rare. Has the "modern" diet gotten us addicted when we're kids -- and still very active -- to foods that we should be eating very sparingly which then cause huge weight gains when we continue to eat them after we reach our early twenties and our post education lifestyle has us sitting in cars, behind desks, with little time to get in a workout, and, also, at a time when our metabolisms are slowing down anyway? Something changed because my parents were not overweight when I was a kid even though they did the same amount of commuting and sitting behind a desk when they were in their 20s through 50s as I was doing. I point to the food as the difference. Also, it would not surprise me that the rise of fast food and major chain restaurants popping up on every corner that has made eating out (and the huge portions that are served) far, far more common nowadays -- at least for those that can afford it -- has had a major effect on our waistlines.
``before exhorting "good healthy ways to eat", let's talk about paying people enough so they can afford to do so''
Good point. It's expensive (and getting more expensive) to eat the way the experts tell you to. The outside of the grocery store -- where all the fresh food is sold and the stuff we're all told to eat -- is the most expensive part of the store. Putting together a family meal from those sections costs far more than the box of the heavily processed crap (probably with HFCS listed near the front of the list of ingredients) found on the shelves in the center of the store. The inner city poor don't even get the fresh food anyway; it's all the heavily processed crap. Is it any wonder the poorest people are the most obese?