This is the trouble with media - they will report the same findings with whatever slant suits their agenda. Yes, ignorance plays a part, but I have been seen by GPs who have basic gaps in their knowledge regarding diabetes - how is a reporter expected to understand every nuance and subtlety?
The overall message I got when listening to Radio 5 this morning was a correlation between obesity rates and the number of cases of type 2 diabetes. The doctor talked about controlling the type 2 condition through exercise, diet and lifestyle. Then they had an interview with a likeable, but slightly foolish type 2 diabetic. She was fully aware of what she should be doing to control the condition but despite the guidance and advice, she decided to 'treat herself' to naughty foods whenever she felt like it. She doesn't exercise and sees the recommended lifestyle as a massive change from her current path.
And that was the point the BBC wanted to make: Although there was a history of diabetes in her family, some responsibility lies with the individual to do their best in the treatment and control of the condition.