junk food

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.

1970–75, Americanism

junk-food, adjective
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World English Dictionary
junk food
food that is low in nutritional value, often highly processed or ready-prepared, and eaten instead of or in addition to well-balanced meals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

junk food n.
Any of various prepackaged snack foods high in calories but low in nutritional value.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Idioms & Phrases

junk food

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]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Not that it has to be junk food to inspire play, of course.
Most must resort to an iron self-discipline bolstered by a hefty dose of
  superiority over those who eat junk food.
The diets of many people in developed countries are too high in the fats, salt,
  and refined sugars found in junk food.
But they persevered, and the result is gourmet junk food.
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