|food that is low in nutritional value, often highly processed or ready-prepared, and eaten instead of or in addition to well-balanced meals|
junk food n.
Any of various prepackaged snack foods high in calories but low in nutritional value.
junk food definition
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]