Why the smell and taste of food items change?

Due to which process, there is a change in smell and taste of food items which contain fat and oils?

Starch in food items

Taste of food is based on its

How do we taste food?

Why the smell of body spray spreads

We would have observed that the plate that covers the cooked food items have water droplets inside. Why? Explain.

Name the term used to indicate the development of unpleasant smell and taste in fat and oil containing food due to oxidation . What are anti-oxidants ? Why are they added to fat and oil containing food.

Which term is used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation (when they are kept exposed for a considerable time) ?