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Some people with diabetes use continuous glucose monitors , or CGMs, to track their blood sugar. The small disc, which is usually placed on someone’s arm, can tell them whether their sugar levels are “crashing” or “spiking” in real time.

But recently, I’ve seen a trend: people without diabetes have begun using CGMs, too. That’s because some scientists have posited that blood sugar “spikes” might affect everything from our kip to our insulin resistance.

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