empty calories

empty calories idiom
Food that has little or no nutritional value. For example, Snacking on beer and potato chips makes for a lot of empty calories. [1960s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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