FDA warning on smartwatches that measure blood sugar. These tools, sold mostly online, are becoming extremely popular in the United States.

FDA underlines that it "has never approved smartw watches with these performances or other instruments with non-invasive techniques" For confidential support call the Samaritans on 08457 90 90 90, visit a local Samaritans branch or see www.samaritans.org for details. In the U.S. call the National Suicide Prevention Line on 1-800-273-8255.