It wasn't surprising to me,when I watched this programme, at the steady decline of what lots of people like to eat these days. Being an oldie, I don't remember many people who were overweight and obese years ago, and no children either. in my case, I can remember, all the years from the 1940's. through to the 1960's. when people did not eat junk food, or much processed food. In the 1940's we were lucky to even have one packet of biscuits a week, or many sweets, with the rationing stuff.
Fish and chips from the chippy. were a Friday night treat. and the first burger bar in town, the WIMPY, opened in about 1964 in my town.
People either walked or cycled everywhere, as not many cars about.
A lot of people grew all there own veg in those earlier years.My late Mum. and Grand mother, seemed to be always making soups, and stews, to fill the family up, and people didn't seem to be needing any snacks between meals at all.
The food manufacturers, are going to keep on churning this junk food out, all the processed rubbish, if people keep buying it, as it's true, that people get addicted to stuff, even though it's deemed bad for health.
I only remember one person who was overweight in my family, and that was my Late Father,, he always wanted a stack of potatoes with every meals, and then he would eat any leftover food, from other peoples dinners. he had a heart problem in later years, and had a heart attack one morning when getting out of bed, and my Mum found him dead on the floor.