Google’s “Health Guardian” feature set rolled out in late September to Pixel Watches 3, 4, and 5, and is now coming to Fitbit Air users in a new update. Google says the new features include reports on your blood pressure trends and on insulin resistance, which is a big claim for a wearable. Here’s what we know about Health Guardian, including how to set it up and what to expect.
Google Pixel Watch 5 (41mm) - Android Smartwatch - Obsidian - LTE $499.99 at Amazon Learn More Learn More $499.99 at AmazonCan you really measure insulin resistance with a wearable?
Credit: Beth SkwareckiInsulin resistance is normally measured with bloodwork. For example, your fasting glucose levels and fasting insulin are combined into a score called HOMA-IR. If you’re concerned about insulin resistance or pre-diabetes, it’s best to talk to an actual healthcare professional to find out what tests they recommend, and what to do with the results.
Google published a paper describing some of the testing that went into developing its insulin resistance algorithm. In the study, the researchers had people use their own Fitbits or Pixel Watches to record a variety of metrics, including heart rate, HRV, and activity. It’s not clear from this paper exactly how the algorithm works or whether it’s likely to be useful in a general population, but apparently Google is betting on it being an interesting factor to track in your Google Health app.
Can you really measure blood pressure with a wearable?
Credit: Beth SkwareckiGoogle said last month in a press release that Health Guardian, which includes insulin resistance and blood pressure trends, is available for free for people who use a Pixel Watch 3, 4, or 5. Fitbit Air users, they added, would get blood pressure and insulin resistance trends “with a Google Health Premium subscription later this year.” "Later" has arrived, as the feature for Fitbit users is in Google Health 5.11, available on both Android and iOS.
How to get Health Guardian’s blood pressure trends and insulin resistance estimates
The Pixel Watch got Health Guardian in the 5.09 release of the Google Health app for Android. The Fitbit got Health Guardian in the 5.11 release for both Android and iOS.
Google said that the insulin and blood pressure features will give you a monthly report on the first of each month, with the first report coming Oct. 1, if you have given the watch enough data in the previous month. If you're a Fitbit user and are just setting up the feature now, you'll get your first report on Nov. 1. Here is what the app requires:
For insulin resistance: You need to wear the watch for seven days and nights in the previous month, but they don't need to be consecutive.
How well does Health Guardian work?
What's more confusing is what you're actually supposed to do about the results. If your watch says your blood pressure or insulin are fine, would you delay seeking care or abandon a treatment or lifestyle change that was supposed to help you? If your watch says something is wrong, would you believe that and maybe spend unnecessary time and money getting checked out? Pixel Watch users are discussing their results online, with a variety of reactions. One redditor says: "I awoke to find out that my blood pressure is too high and apparently the insulin in my body does nothing. This despite that my most recent doctor's visit and blood work were all perfectly normal." Another said: "I got this high insulin result this morning. I have really changed my diet the last four months and I have been going to the gym regularly. I have lost about 40 pounds this year. It's a bummer to see this. I just wonder if it's accurate." I wonder that, too.
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