Normal bread can get stale, dry and hard. But packaged sliced bread is much less perishable. I've seen sliced bread having the same texture and taste after a whole week of lying on a kitchen countertop. And when you read the ingredients on its packaging, you begin to understand why, as sliced bread is subject to the techniques of processed foods such as the addition of preservatives, antioxidants, stabilizers, anti-caking agents, or packaging gases, in addition to that bread being bleached, blanched, stripped of nutrients and with added sugar to make it taste better and because high-fructose corn syrup is so cheap, so why not. In addition sliced bread is subject to every health-related fad in existence. Low carb bread? Sure. Bread with Omega-3? Of course.
Basically the packaged substance in super-markets is anything but bread, then we wonder why our meals don't satisfy us and why we get fat.