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A ketone is any of a large class of organic compounds containing the carbonyl group, C=0, whose carbon atom is joined to two other carbon atoms, that is, with the carbonyl group occurring within the carbon chain.

Ketone bodies are produced as intermediate products of fat metabolism. They are normally created in limited amounts when fat is oxidized. However, in drastic conditions where carbohydrate is insufficient or unavailable for energy needs such as starvation or untreated diabetes, excessive amounts of fat are oxidized and ketone bodies accumulate. This condition is known as ketosis.

Kreutner, Patricia A. 1980. Nutrition In Perspective. Prentice-Hall, Inc., Englewood Cliffs. 665.