In the US in the 1970's even when people were just beginning to get fat, most people were normal weight.
The state of health outcomes in Europe today suggests to me that cigarettes, croissants, and wine are not half as bad for you as the trash most Americans eat.
The proportion of Americans that sit on their fat behinds doing nothing is staggering. Obese people are less likely to do simple home maintenance tasks and are generally useless. Sure you find a fat guy who does roofing or plumbing, but typical obese people are physically useless.