Question

What happens when food materials containing fats and oils are left for a long time ? List two observable changes and suggest three ways by which the phenomenon can be prevented .

Answer 1

Dear Student

When food materials containing fats and oils are left for a long time they become rancid and sour in taste.

Observable changes include:

1. Change in taste: food becomes acidic

2. Change in smell: bad smell

Ways to prevent rancidity:
i) Adding antioxidants which prevent oxidation.
ii) Keeping food in air tight containers.
iii) Flushing packed food with nitrogen gas.
iv) Keeping the food away from sunlight

Regards