A study conducted at the Johns Hopkins University School of Medicine monitored 5 thousand men and women over a 3-year period, and found participants with depression symptoms had a 42-percent greater chance of developing type-2 diabetes.

Conversely, participants who were being treated for type-2 diabetes were 52 percent more likely to become depressed.

Researchers say part of the reason may be stress from having to monitor insulin and glucose levels.

The study was published recently in the Journal of the American Medical Association.