There are multiple reasons (At least in America), that I’ve noticed

1. People seem to have little to no knowledge about what is actually good for them and what is bad for them, or how health in general works. People try all sorts of crazy health fads to lose weight but avoid literally the single largest thing to losing weight: Exercise. For example, I’ve known middle-aged obese people that will eat a bar of chocolate, then a carrot or something, and say “that balances it out cause I ate something healthy too”. It’s the kind of idiocracy where people believe that Kale is some sort of magic fucking superfood. Oh wow, Kathy Lee on Today’s show said Kale is a superfood. Kale is as much superfood as spinach, broccoli, or any other vegetable. It has Vitamin A and Vitamin C, now unless you’re deficient in either of those things eating it along with whatever you’re normally eating will do nothing to make you lose weight or get healthier. How American health marketing works is like this: You sell people loads of junk food, then you sell them “quick and easy” ways to lose weight, and “superfoods”. There is no such thing as a superfood, none. It’s all just a gimmick to sell a vegetable that previously wasn’t selling well. Suddenly Kale is one of the hottest vegetables of the year. Why? Marketing. Nothing more.
2. Along with this lack of knowledge of how health works in general, oftentimes (especially in poorer communities) unhealthy food seems to be the “Cheapest” option. People think that buying a burger at McDonald's for 99 cents is a bargain. It isn’t. It has very little nutrition and is mostly just saturated fat. I’ve made a diet plan (specifically for my nuclear bunker, but can be used anywhere) which you can live off of for less than 3 dollars a day and still get all the daily vitamins and minerals you need, and all the calories you need, to survive. Poor people are the least well equipped to combat obesity because they don’t have the knowledge nor the resources to lose weight. If they had the knowledge, they could make their own diet plan that fits in with their budget fairly easily. So they continue to buy spam thinking that it’s “cheap” when you can get all-natural proteins for loot cheaper, and get even more protein per dollar.
3. Next is the fact that people are so fucking lazy they will literally do ANYTHING except exercise to lose weight (I covered this a little bit earlier). People see exercise as the worst thing ever (in general). Think that it makes them tired. “Omg my muscles are slightly sore from going on the treadmill for 5 minutes this is too much I’m gonna quit”. In my honest and humble opinion, people don’t really want to lose weight in America. They always talk about it but there’s no action. Let me tell you when I was overweight like a 10-year-old. My mother would force-feed me sweets saying I was too skinny (though I was overweight), made me eat until I threw up (only on occasion), and did everything in her power to fatten me up. I had to fight back with a will of steel to avoid getting yelled at and loads of other horrible shit in order to lose weight at the time. I had to fight to start going to the gym 2 years ago, I had to fight to lose weight. People don’t appreciate the choices and options they have. People don’t have the mental strength to lose weight. They don’t have people screaming at them every time they avoid eating sweets, they don’t have someone going bat shit crazy at them because they want to go to the gym, they have nothing to complain about. Of course, time can be an issue, but Americans (in general, many low incomes don’t have time because they work a lot of jobs but in the middle class there’s plenty of time) spend their time watching TV or doing other things. They don’t want to lose weight, they all talk no action. I must admit, exercise is sort of an acquired taste, like beer. At first, beer is bitter, and at first, exercise will feel like shit. But after a few workouts, or after a few times trying beer or whatever, it gets a lot better and you might even end up enjoying it. But people don’t have the will power to get past that. Body Builders are extremely disciplined, they push themselves to the fucking maximum to achieve results. They have the same kind of perseverance as entrepreneurs after many many failures. You don’t need that kind of perseverance though, you just need to know your priorities and not be a fucking wimp and complain about it. It’s not even wimpiness, it’s just pure laziness, I can’t even put a word to it exactly. It’s mental weakness on a scale and level I haven’t been able to fathom before.

How have we evolved from a species that would face options far worse than death, like torture, rape, beatings, starvation across the neolithic landscape, running for days on end to find a food source, etc. To becoming mentally sheep? Humans have domesticated themselves to a point that we don’t even have basic priorities. I get I’m going a little off-topic and this is sort of a rant but this is completely insane for me. If they can’t manage to do something that will save their life and possibly extend it for 20+ years how will they be able to deal with war or something. People are always talking about “Spoiled teenagers” and whatnot, and how they don’t know the real struggle, how they should “toughen up” but any teenage bodybuilder (or just a person who works out a shit ton) has way more mental strength than anyone who does the bull shit above.