To any sane person, it's obvious the high sodium, high fat, high sugar, dog CRAP that is fast food is bad for just about anyone. If a person can't figure that out by how the feel when they eat it, they simply aren't listening to their bodies.
Given, a smoker doesn't often realize how bad they smell, and how bad their physical performance is (i.e. how sick they are) until they quit smoking, and some of that could be said for ignorant folks who've never been taught how to eat properly, but, if you eat fast food and feel like crap, that should be an indicator.
A Burger King Triple has 1160 calories, 76 grams of fat, 51 grams of carbs, and 1170 mg of sodium. The carbs aren't so bad, but, the fat and the sodium, are over the top. Now, if you drink a sweetened soft drink with it, you slam yourself with sugar, and a buttload more sodium. Dumb.
The issue isn't so much the type of sugar as much as the speed (the glyclemic index) that the sugar breaks down. Faster sugar causes more insulin response, which causes more fat storage, and a blood sugar bounce.
Some of the fast food shouldn't be fed to your pets, much less, you.
The USDA predicts that 1 in 3 folks will have type 2 diabetes by 2020. type 2 diabetes is insulin insensitivity, a disease of obesity, and a disease that is 100% preventable with as little as two intense exercise situations a week.
Earlier this week, Logan and I were Walmart here in Lewisville. There was a fat ass kid, about 22, who said "I'm really friggin thirsty." I remarked, "Dude, that's a sign of type 2 diabetes." He grabs his shirt, and says "So is a black ring." (Showing me his narcosis as a badge of courage.) I said, "You understand type 2 diabetes is a disease of obesity and is preventable with as little as two exercise sessions a week." The kid gives me a dirty look, and says "runs in my family." It seems he'd rather lose digits than clean up his diet and get active. What a tragedy. So very sad. Logan, a type 1 diabetic, and I, shrugged and left the store, knowing that if this kid has a black ring at 22, his toes aren't far behind. Pretty pathetic, and NO ONE INTERVENES. Where are the kid's parents? Why hasn't his employer or his school stepped in? We intervene on folks who hurt themselves with drugs, and....we should damned well start doing it on fat asses.