Not at all. It works by displaying a chart that has two humps every day. The chart looks the same every day whether you eat nothing or whether you pig out on carbs. It appears to just be faking it.
Every youtube reviewer of every glucose watch came to the same conclusion.
But I continue to hear that Apple is working on one. The theory is that the watch can sense molecules in your sweat.
Thanks for the honest assessment! I'm sure they'll have to overcome challenges, but good luck to Apple. The CGMs are a hot item in diabetes' care right now.