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Acetone levels correlate well with body fat loss<ref name="Kundu-1993"/>, but are also elevated by the [[Ketogenic Diet]]<ref name="Kalapos-2003"/>, [[MCT]] <ref name="Freund-1966"/> intake, and exercise<ref name="SasakiIshikawa2011"/> even in the absence of weight loss. One study found that a one pound (0.5 Kg) per week fat loss correlated with 1.7 PPM of acetone (67 nmol/L). Each ~40% increase in breath acetone was an additional ∼0.5 Lb (250g) of weekly fat loss<ref name="Anderson2015"/>.
[[File:Acetone Weight Loss.jpg|center|thumb|300px|Breath acetone against average weight loss]]
Breath acetone correlates well (though not linearly) with blood (BOHB) ketone levels<ref name="Anderson2015"/>. This makes it useful for monitoring the progression of a ketogenic diet, as well as for measuring weight loss. The formula below was developed based on 12 adults consuming Ketogenic meals over a short period<ref name="Musa-Veloso-2002"/>:
For Breath Acetone (BrAce) in mmol/L:
BOHB = 0.45 11 * BrAce<sup>0.547</sup> + - 0.118
Note that the relationship is far from exact (r=0.5 or so.)
[[File:Breath Acetone.jpg|center|thumb|400px|The relationship between breath acetone and blood BOHB from multiple studies.]]
* The ketone test strips for Nova Max are cheaper (around $27 for 10 strips), but less accurate and there tend to be a high number of 'bad' test strips. <jfs id=" B006TIEUS0" noreferb="true"/>.
* The ketone test strips for the Precision Xtra are far more expensive (around $58 for 10 strips), but better quality. <jfs id=" B00XIBK8HS" noreferb="true"/>.
* The best option I've found is to order the Precision Xtra strips from Canada for $23 for 10 strips. I've ordered from the Ketone Strips from Universal Drugstore many times and I've been pleased with their service. It takes a couple of weeks for delivery, and shipping is $7. Another option is [https://www.ebay.com Ebay] and search for "Abbott Freestyle Optium ketone", which are from Australia and cost nearer $1/strip.
* You have to draw a drop of blood for this testing, and I'd recommend the Owen Mumford Advanced Lancing Device <jfs id=" B002NPCC1A" noreferb="true"/>. It's not much less painful than other lancing devices, but every bit helps. I also use the narrow (33) gauge BD Ultra-Fine Lancets <jfs id=" B0000DD8VM" noreferb="true"/>.
=Measuring Acetoacetate (AcAc)=
