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>What absolutely baffles me is how people can eat heavy, fatty, food all the time and go about their business as usual....
Don't people who eat badly just feel sluggish and sick and tired *all the time*?<
Well, for one thing, there are a lot of other reasons people consider first. Stressful jobs; overwork; having a lot to do; problems; daily-wear-and-tear are all causes people are more likely to think of before food. For another thing, no, one doesn't feel badly all the time. One just figures one ate too much, not that the food itself is poor quality.
>...do you do that to yourself if it makes you feels so bad, or do people just not realize that it's the food making them feel like that because that's the only kind of food they eat and they've never felt the difference?<
Yep. As others have noted, nutrition education and fresh-food availability aren't as easy to come by as they should be. And if you grow up not knowing this information, it's easy to develop bad eating habits and gain weight in a short amount of time. Relatedly, the "fat is evil; you are all just slobs" harassment overweight people face doesn't help any. Losing weight is a long, frustrating process no matter how hard you try, and unless you make crash-diet kind of progress, you get no points for being anything but a perfect hardbody. And why should overweight people want to listen to folks who regard them as less-than-human no matter what they do--and whose advice doesn't match up to reality? Down deep, one knows those people don't have one's best interest at heart--they just want to take out their insecurities and hatred.