Around 20–40% of the general population are estimated to have insulin resistance—a condition where insulin begins to be less effective in the body, and glucose regulation becomes more difficult. Eventually, this can lead to diabetes. Often, insulin resistance goes undetected until prediabetes or diabetes develops. But now, a more reliable and accessible method of detecting insulin resistance may be on the way. A new study, published in Nature, outlines a method combining smartwatches and routine blood tests to better detect insulin resistance in its early stages, and its early validation testing has shown good accuracy.