Usually behind every headline there's an expert who explains the caveats which undermine your story. But, as one doctor told us, when it comes to the growing number of cases of diabetes in Scotland: 'The more we look at the figures, the more worried we get'. In a BBC Radio Scotland Investigation, Edi Stark reveals the latest research warning that unless Scotland tackles its obesity problem, an epidemic of diabetes will result in ever-younger Scots being diagnosed with this life-long disease.