https://techcrunch.com/2017/09/07/fitbit-is-teaming-up-with-dexcom-for-glucose-monitoring-on-the-ionic-smartwatch/

Wearable fitness makers are increasingly interested in tracking our vitals. Now Fitbit has announced a collaboration with glucose monitor company Dexcom to develop and market products to help those with diabetes better manage the disease, starting with Fitbit’s Ionic Smartwatch.

Starting in 2018, the Fitbit Ionic will show users data from the Dexcom G5 Mobile sensor, which is worn just under the skin and can show vitals every 5 minutes. This means you will have to insert the $900 sensor first.