Oil and fat containing food items are flushed whit nitrogen. Why?

Question

Oil and fat containing food items are flushed with nitrogen. Why?

Answer 1

In the presence of oxygen in the air, the fats present in the fatty food are oxidised to compounds which have a bad smell, i.e., the food becomes rancid. Flushing whit nitrogen cuts off the contact of food with oxygen and protects the food from rancidity.