KEY POINTS
  • Tim Cook has been test-driving a glucose monitor to understand how his blood sugar responds to factors like food and exercise
  • CNBC reported last month that Apple has a team dedicated to the "holy grail" in diabetes: Non-invasive and continuous glucose monitoring
  • Cook iterated in a discussion with university students in February that Apple is "really excited" about its potential in health care
Apple CEO Tim Cook displays his personal Apple Watch to customers at an Apple Store on April 10, 2015 in Palo Alto, California.

Tim Cook has been spotted at the campus test-driving a device that tracks blood sugar, which was connected to his Apple Watch.

A source said that Cook was wearing a prototype glucose-tracker on the Apple Watch, which points to future applications that would make the device a "must have" for millions of people with diabetes -- or at risk for the disease.