Question

what is reason behind rancidity

Answer 1

Oxidation of fats, generally known as rancidity, is caused by a biochemical reaction between fats and oxygen.

Answer 2

Oxidation of fats, generally known as rancidity, is caused by a biochemical reaction between fats and oxygen. In this process the long-chain fatty acids are degraded and short-chain compounds are formed. One of the reaction products is butyric acid, which causes the typical rancid taste.