The answer is Yes and NO. The strips don't differentiate between the ketones from fat you eat and fat that comes out of storage. Both are burned for energy. The good part about the fat you eat is that it does not elicit a big insulin surge. And any reaction on the stix or strips shows that you are getting your body's fuel from burning fat, not carbs. It is better to burn dietary fat than to go back to eating carbs & high insulin levels.

The truth is that those Ketostix (all brands) are really such an inexact way of measuring ketones, that the level doesn't really matter. Any reading means you are in ketosis. Remember that most ketones leave your body by way of the lungs (breathed out) or via the intestines (I am NOT going into detail about that. )

In the Atkins Center in NYC, they use a machine that measures ketones in the breath. A patient breathes all their air out into the machine and a reading is obtained. This is considered VASTLY superior to the stix. But the machine is horribly expensive and big, so we make do with the stix.

Hope this helps.