This board is dominated by leftist thinking, so it's not surprising that when a topic like this comes up, the perceived problems and solutions are leftist clichés: "Big mean corporations ruin everything"; "people should be forced to eat better." Then couple that to the Millennial notion that somehow what constitutes food can be reinvented to embrace things like kale (a vile weed I wouldn't feed to hamsters) and quinoa (gravel).
Look, there's no big secret here. This isn't terribly complicated. The best place to look for answers is to look at my parents' generation, the Greatest Generation (yeah, I'm that old).
My parents both came from big families, and most of these folks were thin well into their forties and fifties. My mom didn't start to put on weight until around 45 or so, and even then she never got to resemble the grossly obese creatures one finds waddling around the local Wal-Mart. My dad likewise. Almost all of my aunts and uncles were thin - my Uncle Ray was as thin as a rail, and my Aunt Helen, who was a major looker - I've seen pictures of her at age 19 where she looked like Marilyn Monroe - remained thin throughout her entire life, into her sixties.
So what did they do? Did they eat "health" food? Hardly. They ate lots of meat and dairy. They ate bread. They ate processed things - this was the generation that ate Wonder Bread, for crying out loud. And in my case, my family heritage was Polish and Lithuanian, which meant all manner of politically-incorrect food - fatty kielbasa, and pork, and lots of starchy things like potato pancakes and potato pierogies and potato potatoes. All swimming in butter and sour cream. And with dessert. They wouldn't have known what to do with kale and quinoa if they had been given it, except use it as cat litter (come to think of it, maybe they DID know what to do with it).
So what did they do differently, back in the day?
-They ate balanced meals. Some meat, some vegetables, some starches, some dairy. People nowadays ridicule the old "four basic food groups" thing, but there was something to that.
-They ate mostly at home. Going out to eat was something one did once in a while - not four times a week. Which meant that most of their food was homemade, and they knew what was going into it.
-They didn't eat overly-large portions at one sitting. Sure, if you were hungry and wanted more, you took seconds. But otherwise, everything not finished simply went into the fridge as leftovers. That's harder to do in a restaurant setting where you get a garbage-can lid portion size and feel obligated to eat it.
-They weren't constantly eating. They ate breakfast, lunch, and dinner. When else did they eat? They didn't; breakfast, lunch, and dinner. Most of us are in situations in the workplace, at home, wherever, where there is constantly food around, and we are constantly "grazing" on snacks without even realizing it. And food wasn't everywhere; you used to go to a gas station and just get gas for your car. The constant snacking takes in more calories than people realize. Remember that even if food is around, you're under no obligation to eat it because it's there; you can in fact simply not eat food. I'm currently fasting for Lent by taking one meal per day, and most of the time I'm not even hungry. Fasting is a good exercise, because it reminds you that you need far less food than you think you do.
-They walked a lot more. They were much more inclined to take the bus or other public transit, which entails walking at least to a bus stop, and walking around once you arrive at your destination. And they just plain walked - there was a downtown-ish area about a mile from the street in the urban area I grew up in, and my mom would think nothing of walking there and back on a regular basis to run errands. Today, we'll circle around in a parking lot for 15 minutes trying to find "a spot near the door." (This is one area where the Millennials have gotten something right, though not for the reasons they think: the craze for bicycles isn't doing a damn thing about the climate, but it does provide bicyclists with good substitute exercise).
-They did much more manual labor. Their jobs often involved manual work, and when they got home, they did manual labor around the house. Most of us nowadays won't consider a job that we can't do sitting down.
So, to be not obese, emulate the above things: eat balanced meals, not too much food, eat at home as much as you can, only eat when you're hungry, walk or ride, and find some means of exercise to replace the labor-intensive job that you probably aren't doing.
How to make all this part of the "culture," I don't know. But it really is what it takes.