In general, it can take 2–4 days if you eat 20–50 grams of carbs per ... Acetone levels can be measured with a ketone breath meter, such as a Ketonix. This meter flashes a color to let you ...

That makes it a fairly reliable ketosis meter ... carb eating. "People shouldn't think that, 'Oh, okay, I just ate one bite of carbs and then 10 seconds later it will reflect in the ketone ...