“they all want you to throw it out and buy new, of course.”
The opposite. Putting it in the fridge makes it last longer.
When something lasts longer, you buy it less often. When you inadvertantly leave on the counter after breakfast and worry, land o Lakes says it’s no good after4 hours, it’s on the next day’s shopping list. Same with cams stamped with expiration date. Soda on the other hand no good after expiration.