Dear Mark: Rancid Fat, Store-Bought Mayo and Rice Bran Oil

March 28, 2011

It’s been a while since I published a Dear Mark post and it’s been a fairly anemic news week, so I thought I’d address a trio of (related) reader questions.
If you’ve ever wondered what it means for a fat to be rancid (both for the fat and your body if you consume it), whether eating just a little store-bought every once in a while is all that bad, or where rice bran oil falls in the spectrum of Primal fats read on.
The first comes from reader Timre –
I am a newcomer to the blog and I have been reading up on oils and fats in here and there is a lot of great information but I am having trouble understanding what fats going rancid and oxidizing under heat means to my health. Can you elaborate on this for me?
Timre

Fantastic question. Before I answer, let’s make sure we understand exactly what […]

Original post by Mark Sisson

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