Tim Cook spotted testing Apple's glucose monitor

Apple Watch Series 3

Apple Watch Series 3

According to a recent CNBC report, Cook is reportedly testing the rumoured accessory to monitor how the blood sugar levels could be controlled by various factors like food and exercise.

Last month, CNBC reported that Apple has a 30-person team in Palo Alto quietly working on non-invasive and continuous glucose monitoring - something that would be welcomed by the millions of diabetes sufferers worldwide who now have to draw blood to get a glucose reading.

CEO Tim Cook has been spotted on the company's campus with a wearable device attatched to his Apple Watch that tracks his blood sugar level, sources told CNBC on Thursday.

The Apple CEO revealed back in February that he was using glucose monitor, although it is not clear if this is the same one as he has been spotted wearing recently. "I just took it off before coming on this trip". Indeed, the iPhone maker is already conducting feasibility trials for a glucose monitoring device in the San Francisco Bay Area, according to CNBC sources.

It's mentally anguishing to stick yourself many times a day to check your blood sugar.

Apple (NSDQ:AAPL) may be developing glucose monitoring capabilities for the next-generation version of its Apple Watch, according to a new BGR report which cites sources close to the company.

"There is lots of hope out there that if someone has constant knowledge of what they are eating, they can instantly know what causes the response and that they can adjust well before they become diabetic", Cook said. Speaking to CNBC last month, biomedical expert John L. Smith said developing such a device has been "the most hard technical challenge I have encountered in my career".