There is a difference between being ketotic and being fat-adapted. You can start producing ketones almost immediately, but that doesn’t mean that the body is really set up to use them yet. When you measure ketones, whether they are in your urine, breath, or blood, they are there because the body isn’t using them. It can take several weeks before the body fully adapts to metabolizing fat instead of glucose.
If you track your urine ketones, for example, you will notice over the next few weeks that the level will go down, as your body adapts to using the ketones instead of wasting them. There will come a day when you post that your pee sticks aren’t registering anymore, and how come you aren’t in ketosis? That will be a sign of fat adaptation; i.e., your body will be using the ketones instead of wasting them in your urine.
The same is true of ketones in the breath, by the way. At some point, if you decide you really care, you will want to get a blood ketone meter to measure the beta-hydroxybutryate in your bloodstream. But even there, it is tricky to interpret the results. The problem is that there is no really good way to measure your body’s fat adaptation; measuring ketones only gives us a rough idea of what’s going on. So as long as you are registering even a little bit, there is not really any reason to worry.
At this point in your journey, you might find it helpful to be clear why you are eating a well-formulated ketogenic diet. Is it to reverse Type II diabetes? To promote metabolic health in general? To lose weight? Knowing your reasons and your goals will help you through periods when your body doesn’t seem to be responding as expected.
For example, my goal is metabolic health, so I am not freaked out when the scale doesn’t seem to be consistently dropping; if weight loss were my goal, that would be a whole different thing. Don’t get me wrong—I enjoy the sensation of my pants falling off my butt, but I enjoy the thought of not having to take insulin even more. And the thought of never having to lose parts of my anatomy to diabetes has even more appeal than the thought of regaining my youthful figure.