There is no secret about the cause of increasing waistlines
I saw a newspaper article earlier this week saying that we are on average 3 stone heavier than we were in the 1960's. It isn't rocket science why that is or no great mystery. Think about it.. in the 1920s and the 1930s people had malnutrition and poor diets with the depression and poverty, in the 1940s there was World War II and rationing.. you didn't see many fat people around at that time unless they didn't photograph them.. the diet that people generally had was much more healthier than today, and up to the late 1980s/early 1990s there was Coal mining, Steelworks, Mills, and Shipyards, heavy manual labour and in the past people walked it to work or biked it and didn't drive or bus it as much... Nowdays people do that and many jobs are much more sedentary. Plus there wasn't as much processed food or fast food as now.