Fitbit Air and Edge add insulin resistance and blood pressure trends

Google added Health Guardian features to the Fitbit Air and Edge: insulin resistance and cuffless blood pressure trends. They are available only to Google Health Premium subscribers at $100 a year, and the algorithm analyzes heart rate, sleep and activity rather than measuring glucose directly.

• Features require Google Health Premium at $100 a year
• Fitbit Air costs $100, Fitbit Edge costs $180
• Insights appear after five days of wearing the device
• Users can connect an Abbott CGM to the Google Health app