If meat is packaged under the watch
of federal inspectors, supermarkets cannot change the date on the
package, but if retailers butchered and packaged the meat
themselves, they can change the label any time they choose. In
fact, 30 states do not regulate the expiration dates for most
items.
Some stores use special lighting to make bananas look more
appealing. They filter an ambient light to highlight the bananas
so they appear more yellow. Water sprayed on produce makes veggies
look fresh, but keeping them wet actually makes them rot faster.
It also makes produce heavier and therefore pricier.