Theresa May was spotted wearing a diabetes patch when she met Donald Trump for a black-tie dinner in London recently. She revealed her type 1 diabetes diagnosis in 2013 and uses the FreeStyle Libre flash glucose monitoring device which has a small sensor that lasts for two weeks and monitors the fluid just under the surface of the skin. When you wear it you can scan it with another device or a mobile phone to get your blood sugar level.
https://www.smh.com.au/world/europe/why-theresa-may-was-wearing-a-white-patch-on-her-arm-when-she-met-donald-trump-20180713-p4zrb2.html
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