In the US (and Europe, too, I believe) food manufacturers are increasingly mandated to be able to trace their ingredients back to the original source. Each hand

In the US (and Europe, too, I believe) food manufacturers are increasingly mandated to be able to trace their ingredients back to the original source. Each handler along the way is expected to do this, so theoretically there's a paper trail from the beginning to the end on a store shelf. If there are particular foods for which you'd like this information, I would check company websites and then reach out to producers if that isn't getting the information you want. I can't say how forthcoming companies are with this documentation. Keep in mind trade secrets could be involved that might be violated just by providing that level of specificity.