Prepackaged snack food that is high in calories but low in nutritional value; also, anything attractive but negligible in value. For example, Nell loves potato chips and other junk food, or When I'm sick in bed I often resort to TV soap operas and similar junk food. [c. 1970]
n. food that is typically high in fats and salt and low in nutritional value; food from a fast-food restaurant. Junk food tastes good no matter how greasy it is.