Type 2 diabetes is a lifelong condition which keeps the body from using insulin in the right way, and those living with the disease are said to have insulin resistance.
Those most likely to suffer with type 2 diabetes include people who are middle-aged or older, however the condition is affecting more and more children and teenagers due to rising levels of childhood obesity.
Around 84 million in the world are said to have pre-diabetes, meaning their blood sugar is high but not high enough to be diabetes yet.
