Rancid oils won't make you sick, they just have an off flavor and smell.
Originally Posted by Ashleynicol
Rancid oils are toxic, as with any "bad" food. They may not make you sick per se, but can cause damage at the cellular level. Sun doesn't make you sick either, but it can and does damage cells if you're out in it on a consistent basis. Just using that as a comparison. Do some research on it.
Originally Posted by poxyfairyplume
Do you know of any legitimate sources that show harmful effects? Any studies? When food goes bad its the bacteria that makes you sick.
Originally Posted by Ashleynicol
Here's an excerpt from a Chicago Tribune story:

<< So what's wrong with eating rancid oils?

"There are at least two," says lipid specialist and University of Massachusetts professor Eric Decker. "One is that they lose their vitamins, but they also can develop potentially toxic compounds" that have been linked to advanced aging, neurological disorders, heart disease and cancer.

"They're carcinogenic, pro-inflammatory and very toxic," says integrative medicine specialist Andrew Weil. "They are also widespread in the food chain." >>

Link to entire article: A kitchen full of dangerous products - Chicago Tribune
shoulder-length 3a/b, depending on weather and products (or lack of products!)