Pages back posters were mentioning white bread. French bread is made with a different flour, T55, and the loaves and sticks made daily in the local boulangerie are a world away from supermarket bread we get here. Ever since the sixties, (anyone remember Wonder Loaf?) the industrial production of bread has meant an increase in coeliac disease as well as other gut problems. Bread only needs flour, water and yeast, plus some salt. Supermarket bread will contain sugar, fat, L-ascorbic acid, emulsifiers, preservatives and a range of enzymes. All designed to bulk it up and look more than it is.
Wheat has twenty natural vitamins and is highly nutritious. Unfortunately, the milling process reduces those vitamins; Vitamin E by 86%, iron by 76%, Vitamin B1 by 77% and B2 by 80%.
No doubt this 'refinement' of our food takes place across the range so it's difficult to know what we are putting into our digestive system.
Professor Tim Spector head of the Department of Twin Research at King’s College London, also leads the British Gut Project, sequencing the genetics of the microbiome. He reckons our bacteria are unique to each of us, so eating the same food will result in entirely different reactions from different people. As an experiment, his son agreed to eat nothing but fast food for ten days. The bacterial species in his gut reduced by 40%. Dad’s part of the experiment involved three days living with a hunter/gatherer tribe in Tanzania (son obviously drew the short straw!) and his gut diversity increased by 20%.
As others have posted, there isn't a single factor creating the rise in obesity. The fried breakfast of days gone by was needed because most people had physical jobs and/or a mountain of tasks at home. It didn't take long to burn off those calories!
As kids, the point of this thread, we then walked to school, for Primary we walked home for lunch and back again. We waited for tea until Dad got home. There were no snacks. Holidays were spent playing outside - all day. I'm not suggesting we should go back to those days, heaven forbid, but rather stating it's no good using examples from the past because everything, everything was different.