Many older people have both depression and diabetes. Depression is a medical condition causing sadness that interferes with daily life. About 1 of every 5 people has depression at some time in their life, and depression is very common among older people. Sometimes, depression goes away on its own, but many depressed people need treatment with counseling or medication to speed recovery. Diabetes mellitus is a common disease that interferes with the body's ability to store energy from food. Diabetes leads to high levels of blood sugar that, over time, can cause complications that include blindness, kidney failure, nerve damage, and cardiovascular disease (heart attacks and strokes). Fortunately, keeping blood sugar, blood pressure, and cholesterol levels under control can reduce the chances of these complications. Diabetes care requires that a person follows a careful diet, exercises regularly, checks blood sugar levels, and takes diabetes medicines as prescribed. Some worry that when a person has both depression and diabetes, depression can interfere with diabetes care.