How Does A Food Become Rancid. Cooking oil is an essential kitchen ingredient that is until it goes rancid. This series of chemical reactions will diminish the vitaminmineral content and turn oils and fats rancid.
Just the word rancid is enough to give you the chills. By definition rancidity refers to natural spoilage caused by changes in the substances chemical structure notes North Dakota State University. Rancidity happens when fat is exposed to heat light or oxygen over a period of time.
This is why pet food packaging is opaque and does not.
However in other cultures rancid products are part of a regions cuisine eg. Exposing oil to prolonged heat accelerates rancidity. Food spoils when it gets old. Does it vary from bacteria to bacteria.