I'll tell you how far back I go.
I remember my mother handing me the bag, yes bag of white oleo (looked like Crisco) and letting me knead the yellow color tab into the mix.
We've used real butter for years.
A really good book..' Life Extension: A Practical Scientific Approach ' by Durk Pearson and Sandy Shaw. Written in 1982, way ahead of its time.
He promoted the antioxidant theory, minoxidil (Rogaine), and other health issues way before they became mainstream.
He promoted animal fats over vegetable fats for the primary reason that when animal fats start to go rancid (oxidize) you can detect it with your nose at 10 % or less rancid.
Vegetable fats, 30 % or more before you detect it.
Oxidation of body chemicals being the main cause of aging, according to his book, avoiding rancid foods is of primary importance.
He promoted massive doses of antioxidants, vit. C, D, E and others.
Read my post #182. I mixed the yellow powder into the white margarine too. We must be about the same age. :)