The Lumen device is a metabolism breathalyzer and digital nutritionist that claims to help users understand how efficiently their body burns fat and carbs. By measuring breath CO2 levels, the Lumen app provides a score and customized nutrition plan for weight loss, athletic performance, or metabolic health. The device has undergone updates and now requires only one breath per measurement, with an improved app featuring educational videos and a food database. While there are limitations, Lumen has peer-reviewed studies and collaborations with scientists, showing transparency. The device is small and easy to use, with the app providing helpful information and guidance.
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