I believe you're right about the research done in the 60s/70s Yonuh.

Back in the 80s when my kids were babies and I was in my "Earth Mother" stage -- growing my own veggies, making my own bread, canning my produce and hand-processing baby food -- I had a poster on the wall in my kitchen that was all about food additives.

My recollection is that I learned about it on the "Phil Donahue" show, and that I sent away for it. Somehow I am thinking the poster was published by the CDC...
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