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Foods that people canned themselves and then they fermented or aged. Things like sauerkraut, pickles, canned fruits that may have became a little tangy, canned vegetables.

They can't be things that the stores can because those are pasteurized, boiled, pressured, or whatever to make sure they last a long time without changing.

Years ago, canned foods grew bacteria. Obviously, if they got too bad then eating them would cause negative effects. However, prior to that, they were great for the bacteria in the gut.

that would make a lot of sense, because to a degree they still do a lot of that in the middle east (and probably other regions i'm sure)

And that might suggest why middle eastern people might be susceptible to RA etc when they move to western cultures, because their gut is used to these bacterias that all of a sudden stop being supplied to them...

Yes, I would agree with that.