Bear in mind that if you look at 2 products, one with 24 carbs and one with 21, there can be a huge diff. Fibre, for instance, is a carbohydrate but can be subtracted from the total count as you can't digest it. Likewise, any glycol or sugar alcohols have minimal effect on blood sugar and also effectively don't count- even diabetics can eat them with no effect on blood serology.
I'm a big believer in the "low carb lifestyle." Not only did I lose 65 lbs in 4 months on Atkins, I never felt better in my life, starting 3 days in! Now I can hardly stand sugar and my sweet tooth is virtually gone. I just rapidly lost my cravings for the carby stuff.
Now as for overused foods- obviously salt & sugar are towards the top of my list. But I think I'd pick chicken. You ever notice when you eat out that practically everything is chicken? Especially at my favorite local Chinese buffet place. There's one beef dish, one pork and 12 chicken dishes! :o
If we're not supposed to eat animals, then how come they're made out of meat?