The chance of a person living with diabetes developing depression is two to three times higher than that of other people. A 2012 study showed that people with Type 1 diabetes are three times more likely to have depression; while people with Type 2 diabetes are twice as likely to be depressed.
Another 2019 study confirmed these numbers, leading the authors to say that reducing diabetes by 25% could stop 2,34 million cases of depression from happening. But, believe it or not, research shows that the relationship goes both ways. Having depression can also make a person more likely to develop (Type 2) diabetes.