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A hardware-plus-software hybrid: a handheld breath analyzer measures your CO2 concentration to tell you, in real time, whether your body is currently burning fat or carbs, and the app translates that into daily nutrition guidance based on your actual metabolic state rather than an estimate. It’s the most novel approach in the category precisely because it’s measuring something physical rather than inferring from logged food, a strong pick for anyone who wants metabolism-level feedback, not just a food diary.
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