I read an article the other day here: Obesity epidemic may have roots in 1950s - Los Angeles Times which speaks to three things 1950s mothers were advised to do which may have contributed to the startling increase in obesity starting in the 1980s.
1. Don't gain more than 20 pounds during pregnancy.
2. Smoking is a good way to keep your weight down during pregnancy. (Yes, some 1950s doctors actually advised that.)
3. Breast feeding wasn't popular, and since breastfeeding can act as a natural birth control, babies came closer together.
And though those factors may well be a big part in the obesity epidemic, choices are still key. All people had to be doing in the last 40 years was to be taking the time to read food labels, and they would have been at least 50% better off. Cereals, "healthy" granola bars, and phonybaloney yogurt all have labels that indicate little nutrition and lots of sugar.
In general, if a lunch hour isn't enforced at a job, skipping it or just taking a 15 minute break and going home early. When the lunch hour is enforced, eating one's own food, or skipping lunch and taking a walk is a good alternative.
And somewhere in the back of our collective minds, we just had to know that food being sold by the boatload through drive-through windows wasn't as healthy as food we made ourselves. So the proliferation of shitfood palaces is our own fault. If we hadn't supported them, (and still support them, though hopefully not MDAers), they wouldn't be on every corner.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine