We have what used to a historical impossibility - fat poor!
Our poor simultaneously suffer from diseases of obesity and malnutrition (because of their food/snack choices!).
I am 70 years old. When I was 23 I started working for the Phone Company. Illinois Bell. Top wage, top vacation time, top benefits. Most of the folks who worked their collected food stamps and other government benefits. You can guess the rest. I worked Downtown Chicago.
I think the obesity has to do with a lot of modern factors, having a car, living in city apartments and on a couch looking at a screen, mass media advertising of junk food and impulse buying, the food products themselves and mastery of chemistry and human behavior and basic taste impulses and the fact that we now see people that few of us would have seen 70 years ago.
Today one has to work at it to eat well and stay fit, today that lends itself more to the intelligent and well off rather than to the poor and the working poor, I think 150 years ago the boss was more likely to have a paunch than the workers who walked to work and ate basic foods and spent their off time on chores and duties around the house and farm.