Dark circles under eyes can be caused by many diffierent fators. Malnutrition is one of them. The lack of nutrients ( e.g. iron, Vit K)in the diet, or the lack of a balance diet, can contribute to the discoloration of the area under the eyes.Meanwhile malnutrition will affect your body health , for example, your blood perssure may lower than others. The otherl reasons that cause dark circles under eyes are eye dry and eye strain, cold or sinus Infection,extreme stress and depression, and so on.But the top one is Nasal congestion. There are several ways which can get rid of dark eye circles: Vitamins can help reduce dark circles under eye, eye creams are available to help you get rid of dark circles under eye. Here is a blog link that can help you.