http://www.scotsman.com/news/scots-trial-to-test-mindfulness-for-diabetes-patients-1-4132835
“… people who are anxious have high levels of stress hormones such as adrenalin and cortisol, and these cause glucose to be released into the bloodstream, driving up blood glucose levels. Also, depression is characterised by fatigue and low motivation, which can make it tricky to devote the time and energy required to manage complex long-term conditions like diabetes.”