Light and purification

Modern fat consumption musings: since millennia ago, our ancestors have used fats for light and purification, for example,  as candles and soap (assuming most households had them scarce and valued them), but with electrification and synthetics - we eat them more than rendering/separating/extracting them for non-dietary purposes.  While our bodies have seemingly evolved otherwise. What impact would that bring to our pancreases and other organs and systems, I wonder?.. 


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