One of the people said that Apple is developing optical sensors, which involves shining a light through the skin to measure indications of glucose. Accurately detecting glucose levels has been such a challenge that one of the top experts in the space, John L. Smith, described it as "the most difficult technical challenge I have encountered in my career." The space is littered with failures, as Smith points out, but that hasn't stopped companies from continuing to attempt to crack this elusive opportunity.
Apple has a secret team working on the holy grail for treating diabetes
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