Why do food items that are supposed to be stored in a ‘cool dark place’ seem to be fine sitting on well-lit and open supermarket shelves?

Question

Why do food items that are supposed to be stored in a ‘cool dark place’ seem to be fine sitting on well-lit and open supermarket shelves?

In: Other

Answer 1

They aren’t open yet.

Oxygen oxidizes. Once the product is exposed to air it immediately starts deteriorating. That’s why the “best by” date may be several months/years away but you have to use it quickly after it’s opened.