'I have type 1 diabetes and it isn't because of my diet or weight'
With the WHO reporting a fourfold increase in the number of people living with diabetes since 1980, the role poor diet and lack of exercise has in causing the condition is back in focus.
Despite eating well and playing hockey, 19-year-old Lydia Parkhurst has type 1 diabetes.
"It isn't about diet," she explains.
"Type 1 diabetes is an autoimmune disease where your pancreas stops working properly."
BBC Advice has more help and information about diabetes.
Because her pancreas no longer produces insulin, Lydia has to monitor her blood sugar levels throughout the day, and make sure enough insulin is being injected into her body.
Type 2 diabetes is mainly driving the increase reported by the WHO and this is caused by a variety of factors, which can include obesity.
Not all countries in the world have the resources to do the tests which are required to distinguish between type 1 and type 2, which is why global estimates for them as distinct conditions "do not exist", according to the WHO.
"It's important to make the distinction between the two because type 1 is not due to lifestyle choices," says Dr Peter Hindmarsh, a specialist in childhood and juvenile diabetes from University College London Hospitals.
"This is a condition which we don't really know the cause of but it's where the body turns against itself and destroys the insulin-producing cells."
If diabetes isn't cared for properly it can cause a variety of problems, such as damage to eyesight or kidney function.
And if Lydia's blood sugar levels fall too low she could end up in a diabetic coma.
According to JDRF, the charity Continue reading