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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.

Can you really measure insulin resistance with a wearable?

Credit: Beth Skwarecki

Insulin resistance is associated with type 2 diabetes, and can be an early sign that you are heading toward pre-diabetes or diabetes. When your body’s insulin receptors stop responding as strongly to insulin, you’re more likely to have higher blood glucose.

Insulin resistance is normally measured with bloodwork. For example, your fasting glucose levels and fasting insulin are combined into a score called HOMA-IR.…