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keto flu

American  
[kee-toh floo] / ˈki toʊ ˌflu /

noun

  1. a temporary feeling of illness or physical unease often experienced by those starting a ketogenic diet, characterized by fatigue, headaches, muscle soreness, etc., as the body adapts to using fat instead of carbohydrates for fuel.

Etymology

Origin of keto flu

First recorded in 2010–15

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.