Many newly diagnosed diabetics go through the typical stages of mourning. These are denial, anger, depression and acceptance. It may not occur only once. Many individuals cycle back to this phase several times. I diabetes, may reinforce denial.
Denial is a common stance for adolescent diabetics.
The type II diabetic, trying to lose weight, may envy heavier people who seem to enjoy good health. One might erupt at someone who innocently offers a desert. Unfortunately, anger can drastically affect glucose levels. Mild depressive feelings are a normal part of grieving and adaptation. As long as they are not pervasive or prolonged, they may not be harmful.