How can I convince my less fortunate relatives that expired, canned food is still good and should be eaten?

I have two relatives who do not have good incomes and really need to make every dollar count. In fact, one is disabled and is on public assistance.
Both of them throw out expired food. I stressed that I try to never throw food away. If it is not furry or moving I will eat it or cook something with it. To prove to them that it is ok I asked them to bring some stuff they were going to throw away and I would show how it is still good. Of course the food was fine.
Message accepted. Lesson learned. Right? Wrong!!!

Rather than getting the message that they should save money and eat it themselves both of them now save their expired food for me! At each family gathering I am given expired stuff. A box of dusty canned soups, a bag of expired fruit cups, a container of ancient blueberry pie filling. This is the total opposite message of what I had intended.
Right now I am warming a “gifted” can of 2012 vintage, Great Value Cream of Mushroom soup for lunch.
How can my message be clarified and not taken that I need their old food?
How would you approach this?