Look at how many years it took them to figure out that trans fats were the culprit for high blood cholesterol and heart disease. When did they figure that out, around the turn of the century? Prior to that they were saying it was from saturated fats, and prior to that they were saying it was from fats in general, and prior to that they were saying it was from by cholesterol (dietary).
Trans fats were introduced into our diets in the 1940s via the process of partial hydrogenation (full hydrogenation doesn't produce trans fats). Partial hydrogenation is used to turn vegetable oils, a liquid, into shortening, a semisolid or plastic. Butter and unadulterated lard (i.e., not partially hydrogenated) have a short shelf life compared to shortening so shortening has been the darling of the food industry for breads, crackers, cookies, etc.
This long lead time to figure out the problem is part of the reason the flat earthers believe that vaccinations cause autism or whatever it is they believe. "You just never can tell."
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