food, as potato chips or candy, that is high in calories but of little nutritional value.
anything that is attractive and diverting but of negligible substance:
the junk food offered by daytime television.
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.

noun phrase

Foods like potato chips, popcorn, sugar-coated cereals, and the like, esp popular with children and having little nutritional value (1970s+)
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 ]


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