Ketosis Definition
Let's move from an over-simplified ketosis definition to moderately simple one. Ketosis means that the body has gone from using carbohydrates as its source of fuel to fats-almost exclusively.
But it's a little more involved than that. Ketosis starts when there aren't enough carbohydrates in the blood stream to refill glycogen stores in your liver. What is glycogen? The liver makes glycogen from carbohydrates as a kind of quick food source for the body.
A lack of carbohydrates means the body needs an alternate food source. So the body uses fat,