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How to Measure Ketones on a Water Fast

After about day three, your body will switch to burning ketones instead of sugar for energy. This is the sweet spot people! Please keep in mind that ketone measurements are not always a good indication of what's actually going on in your body. Are you losing weight? Has the hunger dissipated? Then rest assured that you in ketosis and don't stress too much about testing ketone levels.

Having said that, the following are the 3 ways to test your ketone levels:

Urine 

You can buy ketone urine strips at any pharmacy and test your urine levels any time you like. Please don't obsess if the sticks don't turn deep purple. Remember this only measure the excreted ketones and not what your body is actually using.

Blood

Blood ketone monitors and strips are quite expensive but this will give you the most accurate results.

Breath

Funny enough, you can buy a regular breathalyzer (yes, the one the cops made you blow into) and other than alcohol, this also measures acetone and gives you a pretty accurate reading of your ketone levels. You can get a basic monitor for about 12 bucks and you don't have to keep buying strips. 

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