I don't know what you meant by "penultimate", perhaps indisputable? But if you don't know of such a resource, how are you so convinced they're wrong? Margarine

I don't know what you meant by "penultimate", perhaps indisputable? But if you don't know of such a resource, how are you so convinced they're wrong? Margarine (with its trans fats) was declared healthy and safe for a long time, until it wasn't.