An article for you.
*****As many as one in every five people with type 1 or 2 diabetes were depressed before they got diabetes, according to a report in Clinical Psychiatry News. This has led researchers to question whether depression may help cause type 2 diabetes in the first place. In a 13-year study of nearly 2,000 people, researchers at Johns Hopkins University found that those who were depressed were more than twice as likely as others to develop the disease. However in a Canadian study, researchers examined the health records of close to 90,000 people over a 12-year period and found that new diagnoses of depression in diabetics and non-diabetics were about the same. The study concluded that type 2 diabetes did not increase the risk of depression. A study of 4,747 subjects in the Netherlands found that patients with diagnosed type 2 diabetes were more likely to suffer from depression than those with undiagnosed diabetes, suggesting instead that depression may be a consequence of the burden of diabetes.*****
https://consumer.healthday.com/ency...-news-176/diabetes-and-depression-643976.html
We then have the 5 stages of grief that many diabetics go through and one of these is depression. This grief process is related to many negative changes in our lives and can include a diagnosis of a chronic conditions.
http://diabetes1.org/News/Relating_the_Five_Stages_of_Grief_to_Diabetes