Question

oil and fat containing food items are flushed with nitrogen why

Answer 1

Oil and fat containing food materials get oxidised when kept open fir a long time. They become rancid and their smell and taste change. Nitrogen is an inert gas. So, oil and fat containing food items are flushed with Nitrogen to prevent them from getting oxidized.

Answer 2

$<bullet> Oil and fat containing food items flushed with nitrogen because nitrogen acts as an antioxidant and it prevents them from being oxidised.$