keto

1 of 3

adjective

ke·​to ˈkē-(ˌ)tō 

1

: of or relating to a ketone

also : containing the characteristic chemical group of a ketone consisting of a carbonyl attached to two carbon atoms

keto acids

2

: ketogenic sense 2

Since keto dieting is restrictive it's a good idea to consult with your doctor before starting.

—Ted Kallmyer

keto

2 of 3

noun

: a ketogenic diet

Salad is great for keto, but the dressing might not be. When in doubt, skip it.

—John Nicholson

Keto is a diet trend that cuts out carbohydrates and sugars to stop the blood sugar from spiking and have the body enter a state of ketosis, a process in which body burns fat for energy because it does not have enough carbohydrates to burn.

—Dan Boudreaux

keto-

3 of 3

combining form

: ketone : ketone body

ketosis

Examples of keto in a Sentence

Recent Examples on the Web

Adjective

Low-carb diets improved triglycerides, HDL, blood pressure, inflammation, and weight, with LDL cholesterol rising more modestly than on a keto diet. —Emily Kay Votruba, EverydayHealth.com, 3 Dec. 2025

People following a keto diet should avoid starchy vegetables like potatoes, corn, and peas. —Lindsey Desoto, Health, 26 Nov. 2025

Noun

To keep it keto-friendly, serve your dip with celery, zucchini, and carrots. —Lauren O'Connor, Health, 25 Dec. 2025

Health-conscious grocery stores like Fresh Thyme Market stock products that cater to diverse dietary needs, such as vegan, paleo, keto, vegetarian, gluten-free, and more. —Matt Emma, USA Today, 8 Dec. 2025

Word History

Etymology

Adjective

(sense 1) from construing of keto- as an adjective; (sense 2) by shortening

Noun

by shortening

Combining form

ket(one) + -o-

First Known Use

Adjective

1891, in the meaning defined at sense 1

Noun

1994, in the meaning defined above

Phrases Containing keto

• keto diet

Rhymes for keto

• kato
• thereto

Medical Definition

keto

adjective

ke·​to ˈkēt-(ˌ)ō 

: of or relating to a ketone

also : containing a ketone group