Ketosis occurs when the body is using fat for energy. In the Atkins WOE case, we get into ketosis because we eat little carbs and the body is breaking down fat that we eat for energy.

If while on atkins you would have taken an "Insulin inhibitor", if it existed, you would have high blood sugar levels, and if combined with ketosis would result in a potentially deadly condition called ketoacidosis... Ketoacidosis is a condition could occure with type I diabetics when thier body can not produce insulin, and blood sugar levels go up high, and since the body can not use the sugar for energy without insulin, the body starts using fat for energy and ketone levels go up as well.. Not a good thng..