Hiya!

Ketosis , as defined on Atkins Website:

"Ketosis: Short for Benign dietary ketosis, or BDK, this is a biological process that results when sufficient Glucose as a source of energy is not available from dietary carbohydrate and the body switches to primarily using Fat. Fatty acids are released into the bloodstream, then converted to Ketones, which are used by muscles, the brain and other organs. Excess ketones are excreted in urine."

Hope this helps!

Good Luck and very best to all;
Jake