Grocery stores generally do mark down items for sale.

Their profit margins are very thing. 1%-3%

There's not a lot of profit for them to need deductions to reduce.

Many local food banks already strike deals with grocery stores to get soon expiring items at discount or even free.

In the accounting world, expired food or other items is often called "spoilage."

I buy discounted bananas all the time. They are usually separate from the more fresh ones, and sometimes pre-packaged.

Any food I have that spoils goes to the farm animals that can still eat it and digest it.