4. They cut up food so they can charge more

In the produce department there are luscious-looking slices of pineapple and melon, veggies cut up and ready for cooking or salads. At the meat counter, chicken breasts and beef are cut into chunks and marinated—ready for immediate grilling. There’s no denying that these pre-cut foods can make life incredibly easy. And nutritionists agree that if they get people to eat more healthfully, there’s nothing wrong with them. But realize that you’re also paying a tremendous premium—sometimes up to twice as much as uncut versions of the same food—just so you don’t have to bother picking up a knife.