Two external and independent studies conducted at Tel-Aviv Sourasky Medical Center and San Francisco State University conclude the Lumen device's ability to accurately measure the metabolic fuel usage of an individual as compared to the gold standard for RQ. 

In addition, the external studies conclude that the Lumen index highly correlates with changes in the RQ of a subject as compared to the gold standard for RQ.

So, very accurate. For those of us who don't speak gibberish.

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