Final answer:
Microwave popcorn is classified as a packaged and processed food because it has undergone significant processing and includes added ingredients for flavor enhancement and preservation.
Step-by-step explanation:
Microwave popcorn fits into the category of packaged and processed foods. Packaged and processed foods are those that have undergone significant processing to change their original form. They often include added ingredients, such as salt, sugar, fats, and preservatives, to enhance flavor or extend shelf life. Examples include candies, snack foods, margarine, cheese, soft drinks, jams, jellies, gelatins, pudding, and pie fillings. These foods can also be more allergenic, with additives like artificial colors and flavors, sodium nitrate, BHA and BHT, olestra, caffeine, and monosodium glutamate potentially causing issues for some individuals.