But don’t go changing your diet just yet, reassured the researchers.
Experts blame rising obesity and cuts to council budgets.
In many areas of the UK you have to pay for the sensor – but it is free in both areas where the Prime Minister has homes.
She needed it to quickly top up her blood sugar levels.
This according to a report by Statistics South Africa on mortality and causes of death for 2016.
It's thought an extra one million people have diabetes but don't know it.
Mark regrets delaying his type 2 diagnosis which doctors believe caused his stroke.
Would you wear it?
Ian Armstrong called the NHS programme a 'life-saving experience'.
Only Government and manufacturers working together can reverse the obesity trajectory