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>We currently don't measure fructose level

Apologies, but I'm unsure if you're saying that no devices measure fructose level, or just the watch doesn't measure fructose level.

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as far as I know no continuous measuring device can measure your blood fructose level. It was mentioned in the book, saying that different kinds of foods might spike your blood glucose level in a similar fashion, yet behind the scenes blood fructose could be wildly different, with a different body reaction.

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